outbound: week 2, Monday, New York to Los Angeles Ticket B return: week 2, Friday, Los Angeles to New York The traveler could rearrange the itinerary, nesting a round-trip home within the round-trip to Los Angeles such that the outbound trips on both tickets are in the first week and the return trips are on second week. Ticket A outbound: week 1, Monday, New York to Los Angeles Ticket B outbound: week 1, Friday, Los Angeles to New York Ticket B return: week 2, Monday, New York to Los Angeles Ticket A return: week 2, Friday, Los Angeles to New York In such case, the traveler appears to stay at the destination on the weekend for both tickets (staying at Los Angeles for ticket A, and at New York for ticket B), thus taking advantage of the Saturday-night requirement for both tickets. Within North America, the usefulness of the strategy has diminished materially, as most airlines have abandoned the discount for a Saturday-night stay-over for these types of trips. However, many intercontinental round-trip tickets still have minimum length of stay requirements. Back-to-back ticketing is useful with tickets if there is a minimum length of stay on the discount (such as 7 days), and the traveler needs to stay in the destination only for a shorter period of time. This is in contrast to end-on-end ticketing where a traveller combines two different round trip fares, joining together at the connection point, onto a single ticket, for example, an A–B fare and a B–C fare issued on a single ticket allowing travel from A via B to C and back. Legal status and consequences Airlines are strongly opposed to booking ploys for financial reasons. Other reasons cited by airlines include "public safety" concerns, but these are usually not explained. Many airlines have established means of identifying and penalizing travelers who take advantage of such tactics, most notably through their frequent flier programs. Booking ploys are generally a breach of the contract of carriage between the passenger and the airline. Violating the contract is generally a civil matter. When a traveler is shown to have practiced such methods, airlines may respond by confiscating tickets, canceling frequent flier status (and possible confiscation of mileage), and billing travel agents for the fare difference. Airlines may also try to claim reimbursement from passengers, or even ban the passenger from flying with them. In one case, Lufthansa