Before covid I made about 200 flights a year. So I have a pretty good idea what is involved in booking a flight.
Also in the past month at least 3 friends flew from Bangkok to Amsterdam on KLM. So there seems to be no issues there. All these flights where reported to be half full.
Also looking at skyscanner for coming Thursday the 18th there are many flight options to get back to London. The cheapest one way being Qatar for 395 euro.
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Mogens Nygaard Qatar and KLM are flying 100% sure