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The the shortest, longest retention that what is airline ticket is restricted?
From;  Author:Stand originally

Airline ticket of international of a lot of indulgence all asks viatic date of the guest satisfies the restriction that the the shortest, longest retention is restricted, this is to point to:
The shortest retention: The shortest day that the guest must keep in destination is counted.
The longest retention: The longest day that the guest can keep in destination is counted.
Divide this beyond, some fare are right still set out, going there and back is Zhou Zhong still has there is a demand on the weekend.