The hedge fund manager discussed two positions his firm has taken, both relating to leasing in the transportation industry. : Hedge fund manager David Einhorn discussed two positions his firm has taken, both relating to leasing in the transportation industry. The Greenlight Capital founder and president said his fund has a long position on AerBus and a short on GATX. AerCap is involved in airplane leasing, while GATX is a leader in rail cars.