I cannot recommend enough KDE itinerary, which allows you to travel using planes, trains, buses, bikes without using the inevitably broken and privacy violating apps from the various operators.
Caveat: it's not big fingers friendly, and weirdly treats the "back" gesture as "close".
But it's so nice...
A new combined journey details view, ride sharing and support for new Apple Wallet pass formats - the past two months around #KDE Itinerary: https://volkerkrause.eu/2026/08/01/kde-itinerary-june-july-2026.html