Note that "most aircraft" maybe applies if you count globally and include all the ones sitting still in a hangar. Larger aircraft never fly on NDB. Everything

Note that "most aircraft" maybe applies if you count globally and include all the ones sitting still in a hangar. Larger aircraft never fly on NDB. Everything with a flight management system (which is all airliners currently in service in developed countries) will use GPS + DME/DME + inertial systems as backup and auto-tunes VOR also as a backup. The computer will not use NDB to update the position, even if GPS fails. We do fly procedures (holdings for example often in Europe) based on NDB, but we do it using the GPS position of the NDB, not the actual radio signal.