Las reglas dicen:
Before taking their first turn, players must choose which Destination Tickets they will keep from among those they were initially dealt. Each player must keep a minimum of two tickets although they may keep more. Put any Destination Tickets you wish to discard back in the game box without letting any of the other players see them. The Tickets that are put away may either be long routes or regular ones. The tickets you decide to keep are held until the end of the game.
Entonces, se puede regresar 2 destinos, y uno puede ser el largo.