My fav jet route would probably be KUL - HKT, KUL always being the airport I depart from and HKT being my favourite destination. Very little traffic movement makes for short taxi times, almost always good weather, with 10-20 knot winds thrown in there, but mostly coming head on, so not much of a crosswind, and the beautiful approach, especially during sunset approaching runway 27, with the sun right in front of you. Try out the A_A sceneries VTSP if you want, it really makes the airport more beautiful. My second favourite route would probably KUL - DEL. 5-6 hours enroute time, fairly good taxi time 10-20 minutes, and a challenging approach with the low visibility and haze covering the airport.