Is it really true that when you put a REA msg into the system, the MINLINEUP is only taken into account from the time the msg is put in? I.e. once the minlineup time has expired you could get a slot that's in 4 minutes time on minlineup of 20 mins (as happened yesterday) which is Dafty McDaft when the a/c is waiting on stand for any improvement and taxi time is 20 mins! (Got him airbourne within the slot though.
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If this is the case, can anyone explain why it is so?