[sokoloff]

That's not new. Air changes per hour on pressurized airliners have always been in the 10-20 changes per hour (typically 12-15).

More changes costs some incremental fuel (as it siphons pressurized bleed air), but the effect is quite small.

[dhimes]

I had read it was 4 times an hour prior to covid.

[sokoloff]

That’s office building territory. Airplanes have always been higher.