My left ear still feels like clogged after flight. i had flu when i was on the flight.

Ear Tube Antics: The eustachian tube connects the middle ear to the back of the throat. When swallowing or yawning, the tube helps equalize air pressure by opening and closing. When flying at altitude in a pressurized cabin, the normal function of the tube can be altered, especially if inflamed by an illness. Water consumption can help open/close the tube, but avoid blowing the nose too hard; time will fix it!