It's a common scenario in Europe. It's not "exotic" to take a €39 train ride from Paris to Brussels to visit for the weekend.
I don't think it's a privacy concern to store such data locally on the phone. In any case, it should be resolved by letting the user decide how long to cache the data; that would make everyone happy.
I don't think it's a privacy concern to store such data locally on the phone. In any case, it should be resolved by letting the user decide how long to cache the data; that would make everyone happy.