I would imagine something like Starlink could help with the deadzone issue?
There was a startup around like 5-6 years ago (gone now, can't find any info on them, their name was "Flamingo" something or other) that had a proof of concept solution but they burned out quickly.
Source: https://spacenews.com/spacex-plans-to-start-offering-starlin...
A Starlink receiver always has the satellite(s) in fairly fast motion, and phased array antennas can "move" quite quickly, so it's possible that there's no particular challenge to an aircraft scenario. Then again, the basic rooftop unit may make some simplifying assumptions and aircraft would require better hardware and/or software, but that's not a big problem as they can handle a higher price point.