Take notes of when your symptoms are at their worst so you can prepare by keeping a spare supply of artificial tears handy to use preemptively.
Do you always get dry eyes when you travel? It could be the low moisture levels in the air in the airplane. What about during long drives? Perhaps it’s due to the wind in your face when the windows are rolled down.
There are a multitude of scenarios which could ultimately be leading to dry eye symptoms. Try keeping a symptom journal of when your eyes feel the worst and over time you may notice patterns and come up with ways to slightly alter your behaviour to avoid symptom onset. Additionally, bringing this sort of information to your eye doctor may be helpful as he or she could be able to identify patterns that aren’t immediately obvious to you.