Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have clicking sound in your ear after flight . Well this some times occur due to pressure difference in flight . The condition is known as ETD (Eustachian tube dysfunction) . When people with upper respiratory infection , post nasal drip or sinusitis travel in flight mucus from throat area enter the eustachian tube (tube that connect upper throat to middle ear and balance pressure of middle ear ) due to pressure difference . This causes clogging of eustachian tube and leads to ETD . I would suggest you to consult ENT specialist (ear,nose,throat) for proper examination and rule out other causes like ear infection . Doctor may examine nasal passage , back of the throat ,ear drum to confirm the diagnosis . Doctor may prescribe decongestants , mucolytic agent like ambroxol , antibiotic course for infection and may also implant pressure equalization tube . For now give warm compresses to ear several times a day and keep you ear dry . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari