Another issue was that large dirigible airships, while still having to obey the laws of physics, could usually tell wind currents to go get fucked and power on regardless. That meant many a boring day for a sky marshal was ruined by someone slamming through their doors in a panic, saying a huge shining asshole of an airship was crossing their part of the border without notification when they had neither the resources nor manpower to deal with it. That meant the sky marshal having to attend to the matter personally.