Many aviation systems predate the internet. Depending on the region, some systems do not use Internet Protocol, let alone TCP.

The FAA Telecommunications Infrastructure (FTI) operated by L3harris was built between 2002 to 2007.

That is already well within the era of IPv6, let alone "the Internet".

There's no excuse.

For something so incredibly critical in real time, I’m not sure I would want to trust the Internet.

	▲	technol0gic 6 minutes ago \| parent [-]
		thats like mandating using I-95 for all ambulance & firefighter traffic