On the 1st part, if your card was compromised and you called and canceled that, then your reservation becomes flagged in the reservation system as a potential fraudulent which would prompt you to have to buy a new reservation I have seen many many times.
As far as the 2nd part things happen, and customs facilities can get over crowded and backed up. The airlines can not control that. The airlines depending on the destination and curfews that may be in place at certain airports will/would rebook you onto the next flight. Curfew violations can be steep so those flights tend not to be held.
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