Originally Posted by
MostlyUA
I heard on one of the news channels that Qatar Airways or Emirates has it, and that it will be universally adopted by other airlines. I assume if anybody knows, it would be this forum
Mostly false. There are several different competing proposals, and there's zero immediate likelihood of universal adoption of any of them.
Furthermore, it's not really the airlines who need to agree, although their support is likely crucial as a practical matter. It's going to be the health ministries of various countries that want to open international flights more broadly who are going to need to agree on the format that they want to use.
At the risk of going off-topic, there's definitely no unanimity about requiring proof of vaccination in the first place. There's a very real chance that none of these initiatives ever actually takes off.