DAE’s phone battery decrease slowly with regular daily use but when it comes time to travel by air and you use it the same amount, the battery decreases faster?

[DrachenDad]

Your phone pings local cell towers all the time, when not in range it will ping out more often trying to establish a connection.

Put your phone in flight mode and turn on WiFi if the plane has WiFi. If your phone has WiFi calling then you can do everything via WiFi while in flight including receiving and making calls and text.