both condition can coexist together. its something, already if you have little inflammation of ear and throat(what you have in cluster headache
), air travel worsens it. precautions what you should take- 1. keep eating, specially during take off and landing, which you are already doing. 2. don't sleep in flights. 3. don't push off your chair to back. 4. facilitate yawning. 5. put cotton plugs in ears.
hope this helps you.