Originally posted by mora
AFAIK at least in Finland airliners fly scheduled services to airports without ATC.
Surely not the biggest airliners. They're only flying to airfields with ATC or AFIS (Aerodrome Flight Information Service). At least Finnair nor Blue1 doesn't, I don't remember if it was due to a policy or a regulation. If a position isn't open, they'll be waiting till it's open.
Anyway, ATC is out there to serve the pilots and to sort out the traffic flow. They are the traffic lights and signs of the sky. Pilots do the flying and navigation. Of course sometimes pilots of small planes are lost and ATC has to help 'em out.
Flying would be alot harder if it wouldn't be for the radio beacons set up for aviators. Radio beacons are still the main source of navigation, nowadays also backed up by GPS.
IRS aka Inertial Reference System is used by almost every bigger passenger plane today, which is the main source for navigation.