The enormous spy organization known as S.H.I.E.L.D. certainly doesn't skimp on the budget - in addition to fielding a fleet of flying cars, they also headquarter themselves in the most fuel-inefficient location in the Marvel universe. The S.H.I.E.L.D. helicarrier is a regulation aircraft carrier that has propellors on it, allowing it to take to the skies. Co-designed by Tony Stark, this floating platform is the size of several city blocks and boasts a wide variety of weaponry.