BACKGROUND  
         [0001]    This invention relates generally to computerized travel planning systems.  
           [0002]    Travel planning systems are used to produce itineraries and prices by selecting suitable travel units from databases concerning geographic scheduling and pricing information. In particular, travel planning systems that operate over the Internet are known. Some computer travel planning systems, such as Internet sites, generally produce a set of planning options, or itineraries for the traveller to consider. These options are often in the form of a single list of the possible itineraries from which the traveller may select. Such a display approach makes it difficult to clearly compare, discriminate, focus, and assimilate criteria and information that are likely to be important to the traveller.  
         SUMMARY  
         [0003]    According to an aspect of the invention, a graphical user interface for a travel planning system includes a tabular region of the graphical user interface that displays summarized travel options and comprises a plurality of cells that act as controls and a second region that displays selected travel options resulting from filtering a set of travel options in accordance with a control actuated in the tabular region.  
           [0004]    According to a further aspect of the invention, a method for displaying travel options includes compartmentalizing travel options into bins according to a set of criteria. The invention has compartmentalizing travel options into ‘bins’, according to a set of criteria through displaying the resulting bins in a table.  
           [0005]    One or more of the following advantages may be provided by one or more aspect of the present invention.  
           [0006]    With a summary table as part of a user interface to the travel planning system, travellers can select individual bins inorder to focus on a subset of travel options that they are interested in. Selecting an individual cell displays a secondary level of information about the travel options that are represented in that cell. In this secondary level of information about individual travel options, each travel option has a mechanism for selecting and displaying the details of that specific travel option. The summary table can appears in the top frame of a web browser. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]    [0007]FIG. 1 is a block diagram of a client server travel planning system particularly operable over the Internet.  
         [0008]    [0008]FIG. 2 is a diagram of a query screen for a graphical user interface implemented as a web page from a web browser.  
         [0009]    [0009]FIGS. 3-5 are diagrams of web pages depicting results of executing a query for a round trip based on information entered through the query screen of FIG. 2.  
         [0010]    [0010]FIGS. 6 and 7 are diagrams of web pages depicting details of travel options provided in the web pages of FIGS. 3-5. 
     
    
     DESCRIPTION  
       [0011]    Referring to FIG. 1, a travel planning system  10  is shown. The travel planning system  10  can be used with various forms of travel such as airline, bus and railroad and is particularly adapted for air travel. Travel system  10  can includes a server computer  12  having a computer memory or storage media  14  storing a server process  15 . The server process  15  can include a scheduler process  16  and a faring process  18 . An example of a scheduler process  16  is described in copending U.S. patent application Ser. No. 09/109,622, entitled “Scheduler System for Travel Planning Systems”, filed on Jul. 2, 1998 by Carl G. DeMarcken et al. and assigned to the assignee of the present invention and incorporated herein by reference. Also an example of a faring process  18  is described in copending U.S. patent application Ser. No. 09/109,873, entitled “Graphical User Interface for Travel Planning System”, filed on Jul. 2, 1998 by Carl G. DeMarcken et al and also assigned to the assignee of the present invention and incorporated herein by reference. Other travel planning systems such as those on the Internet can also be used.  
         [0012]    The scheduler process  16  provides itineraries to a faring process  18 . The faring process provides a set of pricing solutions by finding valid fares corresponding to the itineraries produced by the scheduler process  16 . The faring process  18  also validates the fares for inclusion in a set of pricing solutions. The information to have the server produce the set of pricing solutions is obtain from a user entering data in a graphical user interface as will be described below. In addition, the set of pricing solutions are also displayed to the user through the graphical user interface.  
         [0013]    Referring now to FIG. 2, a web page  50  that is part of a graphical user interface for the client process  36  is shown. The web page  50  allows the user to construct a query which can be executed by the server process  16  to produce flight plan options for the user.  
         [0014]    The web page  50  includes a query table  52  which is a tab table  54  here comprised of three tabbed regions  54   a - 54   c . The first tab is labeled one-way, the second tab round trip  54   b  and the third tab multi-segment  54   c . The multi-segment tab is shown and is substantially the same as the other tabs except that the multi-segment tab allows the user to enter data for multiple segments of a flight by allowing the user to construct a new query segment region. For example, as shown in FIG. 2, the table includes a region  56   a  for entering flight information for a first segment of a flight. The information includes an origin to a destination and information concerning dates and time of travel. The query also allows the user to specify some potential cost saving feature by allowing the user to cause the server look for other airports within 50 miles of a designated airport and include such other airports in answers for the segment. It also allows a user to specify a travel window. The table  54  also includes a second segment  56   b  having regions for entering similar information and includes controls  62   a  and  62   b  for either removing a segment from the query or adding a segment to the query, thus allowing a user to provide a complex arrangement of segments corresponding to multi-segmented flights.  
         [0015]    The web page  50  also allows for entry of passenger information such as the number of adults, seniors, children and infants which may be important in determining the fare price for a ticket. The web page  50  also allows a user to have the server process check seat availability on designated flights. With the check availability box activated, the server process  16  will return travel options for which there is seat availability.  
         [0016]    Referring now to FIG. 3, a web page  70  that depicts results from the server process  16  executing a query entered via the query page (FIG. 2) is shown. The web page  70 , includes a table  72  that summarizes travel options. The travel option summary table  72  is a tab table comprised of a tab  74   a  that groups summary information by airlines, a tab  74   b  that groups summarized information by flight times and a tab  74   c  that summarizes travel information by airports.  
         [0017]    As shown in FIG. 3, with the airline tab  74   a  selected, the summary information in the table is arranged in rows and columns with here each of the airlines arranged in columns of the table as links and each of the rows of the table  74  arranging specified travel options such as nonstop flights or one-stop flights, as links. Interior cells within the table  74  are links which correspond to prices for each of the airlines with respect to each of the travel options. The table displays a set of air travel options according to specified criteria, e.g., the airlines used in one or more of the travel options (displayed from left to right at the top of the table), and the number of stops or connections in the set of travel options. Here, the travel options represented by a given table cell are those options which use the airline in the same column as that cell, and that have the same number of stops as the “number of stops” header in the same row as that cell. A third criteria, price (i.e. price of an airline ticket), is displayed in each cell of the table; this price is the minimum price for any of the travel options that are represented by a given cell. Selecting a cell (by clicking on a URL in this case) displays, in the lower pane, a listing of the travel options for that particular cell. Each travel option contains a ‘details’ URL link in the row of information devoted to that travel option; clicking on that link take the traveller to yet a third level of information, a detailed description of that travel option as shown in FIGS. 4 and 5.  
         [0018]    A general procedure to construct the graphical user interface is given below:  
         [0019]    1) Obtain list of query-specific travel options.  
         [0020]    2) For each criteria in travel options:  
         [0021]    Enumerate bins for the criteria  
         [0022]    For each travel option T:  
         [0023]    Place travel option T into some bin  
         [0024]    3) Given the bins computed in (2), compute intersections of bins to determine what bins go in what cells of the summary table  
         [0025]    4) Generate and display summary table given information from procedure (3).  
         [0026]    If the travel system operates on a pricing graph, the links are hyperlinks to a enumeration algorithm such as described in the copending application which can sort through a pricing graph, as described in the above application, and return a set of travel options which correspond to the intersection of here the airline represented in the column and the travel option represented in the selected row. Otherwise the links activate routines to sort through a list of travel options.  
         [0027]    Thus, for example, selecting Delta Airlines and non-stop flights corresponding to cell  75   a  which has value of $378 will bring up all non-stop options on Delta Airlines, e.g., no stops in any segment and depict the top  30  of those results in the results frame  76 . Thus, the links in the table  72  are used to control the display of travel options in the results frame  76 . The results frame  76  includes a plurality of results, here the top  30  results are typically shown, arranged in a table with a hyperlink denoted as “details” which, when activated, brings up details of the travel option such as shown in FIG. 6. FIG. 6 also has a second link which, when activated, brings up booking details as shown in FIG. 7. FIGS. 6 and 7 in addition to showing details of the travel option also shows warnings  80  and planning suggestions  82 .  
         [0028]    Returning to FIG. 3, the table  74  allows the display of summary information in different manners depending on which tab is selected.  
         [0029]    As shown in FIG. 4, when the flight time tab  74   b  is selected, the table  74  is arranged to show departure times between the origin and the destination over ranges of times for the potential days of travel in the outbound portion of the trip in rows of the table, as well as departure time for the return portion of the trip in columns of the table  74  over time ranges in the potential return days. Thus, selecting one of the outer peripheral cells of the table will bring up all flight options on a designated day in the designated time area; whereas selecting an interior one of the cells will produce the intersection of options for a time segment on the selected outbound date and the time segment of the selected return date. The table  72  also depicts the starting or lowest fares for each one of the different time segments allowing a user to decide the most appropriate time to travel giving consideration such as cost and convenience.  
         [0030]    As shown in FIG. 5, when the airport tab  74   c  is selected, the summary table has columns corresponding to destination airports and rows corresponding to origin airports.  
         [0031]    The summary table  74  segments or compartmentalizes travel options into bins, according to criteria that the user might use to select a specific travel option. Each dimension of the table has a travel criteria associated with it (for example, a two-dimensional table would have a criterion along the horizontal rows of the table, and a criterion along the vertical columns of the table). In addition, another, different criteria is represented in the cells of the table. The process for producing an summary table, given a set of travel options and a set of criteria, is given below. For example, other criteria could be used within the interior cells or at the edges of the table.  
         [0032]    The graphical user interface is populated by obtaining a list of query-specific travel options. For each criteria the process will enumerate bins for this criteria, and for each travel option T, the process places the travel option T into some bin. Given the bins computed the process computes intersections of bins to determine what bins go in what cells of the summary table. The process generates and displays the summary table with the determined information.  
       Other Embodiments  
       [0033]    It is to be understood that while the invention has been described in conjunction with the detailed description thereof, the foregoing description is intended to illustrate and not limit the scope of the invention, which is defined by the scope of the appended claims. Other aspects, advantages, and modifications are within the scope of the following claims.
A graphical user interface for a travel planning system is described. The graphical user interface is implemented as a web page and includes a tabular region of the graphical user interface that displays summarized travel options and comprises a plurality of cells that act as controls. The interface also includes a second region that displays selected travel options resulting from filtering a set of travel options in accordance with a control actuated in the tabular region.