I don't often agree with what Twiggs says, but her comment about back up tickets is spot on.
I went to Phuket for a 6 day break and before I left there was 100 seats on QF2 BKKSYD the day I wanted to return. On my last night the coup happaned and those seats had disappeared by the time the check ins had opened. The Aust govt had issued statements telling people to come home if possible, and QF and BA facilitated this, thus 100 seats gone.
I was lucky as I had bought Zed fares on TG/EK and I got on TG. There was a group of FA's who were also there for their days off who got stuck in BKK as they didn't bother with back up tickets. The TG flight I went on had empty seats.
I don't go anywhere without back up tickets and knowing various different options of getting home if needed.