[Jodie Meschuk]

Some of us are more prone to nosebleeds, and men/boys in general more than women. It sounds like you know the cause -dryer conditions (filtered cabin air, the worst!). You can try using the oils proactively when flying, or even an aromaring and making sure to moisturize before traveling with a saline and xylitol spray, plus lots of hydration and immune support with Ningxia and/or the Vitality drops in his water bottle.