And I've run into issues on mine but thankfully being looked after by great concierge key lady who is looking after a VIP and has taken pity on me......
Fingers crossed it will all work out but a/c went tech whilst taxing and is now being replaced. Same plane in CUN might be a bit tighter as almost overlaps with another AA flight and 4 hour stop in MIA after has already now melted to 2 and we haven't set off..... Adrenaline.