LoonBalloon BLUE Air Plane AIRPLANE Jet Adventure Bon Voyage 40in. Party Favor MYLAR Balloon. Accent your plane themed party with this 39in. large unique shape Airplane – Blue foil mylar balloon. The perfect balloon for your plane party, this 39in. party balloon is great for setting the scene! This balloon includes a self-sealing valve, preventing the gas from escaping after it’s inflated. The balloon can be inflated with helium to float or with a balloon air inflator. Balloon arrives uninflated. 39in. Airplane – Blue Foil Mylar Balloon