It seems that many of us, Acne prone people, experience breakouts immediately after long air flights.
The cause is most probably the dry recycled air in airplanes. This dry air will make dry skin drier and cause oil skin to excrete more “oil”. Both effects combined with the stress associate with travel may cause breakouts.
To prevent these breakouts, use no or minimal makeup during flights. Cleanse your skin if your try to sleep in the plan and use a mild gentle oil moisturizer before and after the flight.