The author experienced a high-pitched whine and painful feedback from their AirPods Pro 3 during flights, which they believe is caused by a loose ear seal and noise-cancellation feedback loop. This issue was not present on the ground and was also reported by other users on Reddit. The author suggests that the new foam tips may be contributing to the problem. The issue is not unique to the AirPods Pro 3, as some users have reported similar problems with other AirPods models.