Vertaling van "detour until they " (Engels → Frans) :

Moreover, aeroplanes taking off to the north during those periods had to make a detour until they had reached the prescribed minimum flight altitude before entering German territory.
De plus, les avions décollant à ces heures en direction du nord devaient se dérouter pour atteindre l’altitude minimale de vol prescrite avant d’entrer sur le territoire allemand.