Did the other 3 groups already have their respective STS determinations?
Perhaps the answer is just that simple, why NOT take all the time allowed? By Rule, once STS is determined, there is a 30 day window to submit cards, add to it the TWU & IAM seem to be doing their best to piss all over one and other, if I were an AA mechanic looking for AMFA, I say let it play. As an outsider I know the alliance shenanigans are getting cards signed.
Of all the posters here, you seem to be the one in the biggest hurry concerning the mechanics, and as I recall, you aren't one.