I had a great experience with Lufthansa recently. Wasn't using their app, but received very punctual emails with delay and gate information, to the extent that

I had a great experience with Lufthansa recently. Wasn't using their app, but received very punctual emails with delay and gate information, to the extent that the gate change email came at pretty much the same time as the announcement. Had a new flight, ticket, and gate automatically within about 10 minutes of missing my connecting flight as well.