Is there a list of what information different airlines track about their flights?
There is no particular list that provided by airlines company about their flights because it can be misused, but several statuses are provided:

(from http://www.flightstats.com/go/AirportTracker/airportTracker.do#1)


  Geographic Coverage - FlightStats provides definitive information for approximately 99.5% of U.S. flights, and better than 86% of flights worldwide.
  
  Completeness - FlightStats queries multiple sources to create a record for each flight enabling us to offer a broader range of information (for example, gate information).
  
  Accuracy - We have invested heavily in the areas of parsing, interpretation and error checking and developed the logic that enables handling of difficult issues such as cancellations, diversions and changing schedules.
  
  Codeshare Support - Our codeshare logic enables us to deliver flight information for both the operating and the marketing carriers, filling what is often a major gap in coverage.
  
  Real-time data sources include:
  
  
  FAA ASDI Data Feed
  European Data Feed
  GDS (Sabre, Amadeus, Apollo, Galileo)
  Direct Airport / Airline Data Feeds
  
  
  Batch data sources include:
  
  
  Innovata Schedules
  TSA Security Wait Times
  Security Information
  Health Information
  Consular Information