Is it permissible to combine prayers while traveling by plane, taking into consideration being at the airport two hours before departure, the prayer times, and the time of arrival at the destination?

A traveler is not permitted to avail themselves of travel concessions until they have departed from the town's buildings. If the airport is outside the town's urban area, then combining and shortening prayers is permissible there. However, if the airport is within the town's urban area, then this is not permissible; rather, the traveler should perform the prayers at their prescribed times before traveling.