Complex sentence: More than 40 major airlines participate in the CPDLC programme with Maastricht UAC, average end to end response times (ATC-Cockpit-ATC) being well below 30 seconds.
Split into simpler sentences: More than 40 major airlines participate in the CPDLC programme with Maastricht UAC. Average end to end response times (ATC-cockpit-ATC) are well below 30 seconds.