I don't think "stranding" is the right word. For some time now, UK companies selling "package holidays" (with hotel, air, etc. all from one vendor and with one bill) are required to put up funds that the government uses to repatriate those who are already traveling when a company goes under: https://www.caa.co.uk/atol-protection/ Note that it does not cover trips that people put together themselves; in that case, I e…
These vacationers are in safe countries with good infrastructure. They definitely aren’t stranded like Tom Hanks in Cast Away. However, the other airlines can’t magic up 150,000 seats, so it might mean that some people will take a while to get home.