It would appear not, but there’s nothing stopping us from creating one. People can edit the answer as we find more.
Airlines that ban the Knee Defender
Airlines that discourage but don’t ban the Knee Defender
Airlines that allow the Knee Defender
Airlines with seats that do not recline
Such a list would not be meaningful. All airlines have wide rules to prohibit “tampering” with seats, with Knee Defenders or otherwise; you can improvise one with a well-sized bottle, after all. Those that point out the Knee Defender as banned are only making it explicit that this specific device is not allowed.
More to the point, if the passenger unable to recline complains, the flight attendants will insist that you stop using it.
Credit:stackoverflow.com‘