Probably not directly. But flying in a plane or being in a hot climate can leave you dehydrated, which can make you feel more nauseated than usual. Dehydration during pregnancy is never a good thing, since water helps to maintain circulation and bring nutrients to your baby. Make sure to bring a bottle of water with you on the plane (and don't hesitate to ask the flight attendant for more) and to drink plenty while you're sitting out in the sun. You should also pack plenty of snacks while you travel, since going too long without eating can bring on queasiness. You may want to look into other nausea soothers, too, like ginger candy or motion-sickness bracelets.