In article , Ron Natalie
wrote:

Garner Miller wrote:

Depends on the airliner, of course. Some turboprops have the cabin as
high as 10,000 feet at their service ceiling. That's the highest I've
seen.


Not anything certified in the transport class.

Correct. The OP said "airliner," not "transport category," though.
Since there are still plenty of commuter category airplanes flying
around for Part 121 airlines, it seemed relevant.

--
Garner R. Miller
ATP/CFII/MEI
Clifton Park, NY =USA=
http://www.garnermiller.com/