Air france is obliging passengers to switch off 5G handsets in the airplanes, as 5G waves can interfere with Radar circuits as per latest news:
Which frequency or band are they worried about?
Ideally Radar is in mmwave and Europe just has FR1.
Are they worried about harmonics?
Weather Doppler radar is on DFS band.
But the right channels are not usable anyways.
From UE perspective I don’t see harmonics being an issue.
They should be more concerned with 5G phones (not qualcomm) overheating! 
Good point, why always phone are overheating other than Qualcomm chipset?
I think it might happen if mmWave used.
It has been noticed during Drive Test that others chipset mobiles normally using high TX power even nearby the site. E.g 15 tx power under the site some time.
However Qualcomm chipset not exceeding 0 under the site and not heating.
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Boeing, Airbus executives urge delay in U.S. 5G wireless deployment…
The row between the wireless and aviation industries on potential interference between 5G and aircraft radio altimeters is sounding like a storm in a tea cup! The genesis of this dispute is a report in October 2020 by the Radio Technical Commission for Aeronautics (RTCA) citing potential interference to altimeters operating in the 4.2 – 4.4 GHz band from 5G base stations operating in mid-band spectrum, particularly 3.7 – 3.98 GHz [see here]. This alerted telecom regulators to a possible interference problem that may threaten aircraft safety leading some regulators to impose restrictions on 5G radio emissions and deployments.
Source / Credits: Frank Rayal
5G C-Band Co-Exists with Aviation Radio Altimeters
5G Americas President Chris Pearson discusses with Fabiano Chaves, Senior Standardization Specialist for Nokia, the implications of 5G networks operating in the C-Band on aviation radio altimeters. Despite the fact that C-Band spectrum is being used successfully in dozens of countries around the world with no impact to aviation, US regulatory agencies have taken measures which have delayed the rollout of 5G networks. Find out the facts on how 5G C-Band impacts radio altimeters. For more information, visit: https://www.5gamericas.org/5g-aviation/ And for an even deeper dive, check out our white paper: https://www.5gamericas.org/mid-band-spectrum-and-the-co-existence-with-radio-altimeters/
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Passengers aboard flights in the EU will be able to use their mobile phones just like with a ground-based 5G mobile network