At a user level they all work, and IF there's strong enough interference to swamp the entire band, first it would be operating illegally, second it would probably take everything down.

Just so you know, I worked on these systems (voice and data) on anti submarine warfare aircraft for years.

IF I buy the ticket with the correct sequence of numbers THEN I will never have to work again (and I'll finally have a turbine heli).

Chances are I'm going to get up for work 5 days a week for a long time to come.