Aviation Data Link - Security, Segmentation, QoS

Beginning in 1978, aircraft data link emerged using a VHF network named ACARS (Aircraft Communication, Addressing and Reporting System).  ACARS is a purpose-built, store-and-forward, character-based, messaging service.  Within just over ten years, ACARS was extended to Inmarsat L-band satcom and HF radio.  Five years later (1995) ACARS was delivering Air Traffic clearances. Today Iridium SBD (short-burst data) and even cellular radios communicate ACARS messages. How is the industry migrating to embrace and secure IP networks, and will ACARS ever go away? How are broadband radios being applied to support airplane health monitoring or EFB?

CPDLC - Connecting 40% of the pilots to 70% of the controllers

I read this article from Woodrow Bellamy, Avionics Magazine, updating status of CPDLC programs and professing voice congestion was a growing concern and required benefit from CPDLC

(controller - pilot data link communication)

Advancing CPDLC