1. Martin Mars Water Bomber The gigantic Martin Mars, the world's largest flying water bomber and the last of its kind, will make its first trip to EAA AirVenture Oshkosh this year. The massive airplane will be parked near the EAA Seaplane Base on Lake Winnebago, just a few miles east of the main fly-in grounds. It will also fly several demonstrations throughout the week during the daily afternoon air shows. You don't want to miss this, and thanks to the Martin Mars flying boat's huge size, you won't.