El Venus here’s a link:
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I’ve only used to show an airline to board. Getting a visa, maybe immigration can tell the company if they look that deep.
On London’s site:
Royal Thai Embassy in London currently says that, for most visa types, the flight confirmation should be downloaded directly from the airline’s website and specifically says tickets from travel agencies or tickets on hold are not accepted.
I’d assume for them on a METV they’re looking deeper, especially now.
A ticket to Phnom Penh is only $60us. I think you’d be better off to buy a real ticket.