In the USA at least, it's not legal for a passenger of a plane to use cell radios at all. That's apart from the signal being blocked by the plane's metal hull unless perhaps you're holding your device up to a window.

So at least for now, you're stuck with their overpriced wifi.

https://travel.stackexchange.com/a/163104

https://www.law.cornell.edu/cfr/text/47/22.925

Starlink already provides Aviation service. https://www.starlink.com/business/aviation

This is in the process of being installed by some airlines. https://newsroom.hawaiianairlines.com/releases/hawaiian-airl...

Starlink has Aviation product for planes already. That gives internet in flight.

The Direct to Cell gives tiny bandwidth, kilobytes per second. Not enough for normal Internet. Should be enough to text or call somebody.