My Frien Fell And Broke His Wrist Yesterday.he Now Has

my frien fell and broke his wrist yesterday.he now has a full circle plaster from wrist to elbow.at the hospital they split the plaster when plaster when it set after 2 hours, then re-plastered where split. question.he has air flight booked in 5 days time.duration of flight is 4 hours.is it ok for him to take the flight?