Detailed answer

When flying, the low cabin humidity can cause your skin to become dehydrated, leading to a dull appearance. Additionally, sitting for extended periods during long flights can hinder blood circulation, resulting in decreased oxygen and nutrients reaching the skin cells. The combination of dehydration and poor circulation can cause a lackluster complexion. To combat this, make sure to drink plenty of water before, during, and after the flight to stay hydrated. Also, try to move around and stretch periodically during the flight to promote blood circulation. Applying a moisturizer or hydrating serum before and during the flight can also help keep your skin hydrated and radiant.