Based on your description, it is due to pressure change during Take off and landing.
The pressure is equalised by Eustachian tube.
Usually it will equalises middle ear pressure..But at certain situations like Cold, it will be delayed, that gives dull ear ache, blocked sensation.
Next Steps
Check for impacted cerumen. Do Tymapnometry .
Health Tips
Steam inhalation will help to relieve/ Decongestant nasal drops.