Wikipedia
AVIATR
AVIATR (Aerial Vehicle for In situ and Airborne Titan Reconnaissance) was a proposed airplane mission concept to Titan, a moon of Saturn. The concept was developed in 2011 by a team of scientists led by Jason W. Barnes at the University of Idaho. Compared to Earth, Titan has about one-seventh the gravity but four times the atmospheric density. These conditions make it easier to fly there.