For a single segment with no connection, the travel time is equal to the flight time (FlightDetails @TravelTime and AirSegment @TravelTime).
The TravelTime element in LowFareSearchRsp/AirPricePointList/AirPricePoint/AirPricingInfo/FlightOptionsList/FlightOption/Option indicates the travel time, in duration, for the entire journey. The travel time is determined by calculating the difference between the departure time of the first segment and the arrival time of the last segment for that particular entire set of connections. For example:

uAPI : 샘플

TravelTime 화면 구현

Xslt :