Nothing wrong with WG Tunnel. Btw Wireguard is on the IzzyOnDroid Repo.

I usually put all the relevant travel data in my Joplin notebook. If the tickets are availible as .passkey files I manage them with PassAndroid. Transportr for public transportation. Wireguard if you need to access your home network via VPN.

I bet soon more airlines will follow. Our cars are no different either. No much options left for traveling.

I love it so much that I put it right away on my donations list.

Have a link?

Using Argon NEO and quite like it. In my case it was important to have the ability to use a HAT (HiFiBerry).

You probably mean Radicale. Baikal is an option too.