Correct... And as has been discussed and debated in another thread....
Carrying the scanner/listening in the airport is usually cool... but you will need to check with the stews, and see if they will allow it at cruising alt.... Generally on magor carriers- Delta etc,... you will NOT be allowed to use any "radio related device" onboard the aircraft.... There are exceptions... but these are rare these days.... Your more likely to end up with a talk to an SM (Sky Marshall), by using one airborne. Now as for lil commuter jumps and or a helicopter jump.... Things are far more lax....
Now as for that exception to the magor carrier NO rule.... I have a freind that works for Southwest, and often flies to various cities in his work.. I was lucky eneough to be flying with him and the pilot ok'ed both our scanners... He tuned the airbands, i scanned all the PS stuff.... It is amazing to be able to hear an entire state from 30,000 ft.