Slightly off topic but what proton subscription do you have? Proton Unlimited is email + storage via Drive with 500GB and VPN for $12.99/mo if paying monthly, otherwise it’s $10/mo or $8/mo if you pay 1 or 2 years in advance, respectively.
Interesting, because that has not been my experience with multiple airlines. I have always checked it at the gate, and dropped it off at the end of the tunnel just before boarding the plane. Then, during deboard, it’s waiting for me at the same spot, in the tunnel just outside of the plane. This has been the case with Southwest, Hawaiian, Alaskan, and Delta (I think? That flight was 5 years ago so I might be wrong on the airliner, I forget).
Bitwarden has integration with Fastmail, as well as for many other alias services (anon addy, SimpleLogin, etc). They also just added support for selfhosted anon addy, and are working on adding support for self hosted SimpleLogin.
To which app?