Skylift
The Skylift is a very large heavy-lift helicopter featured in Grand Theft Auto IV's The Ballad of Gay Tony DLC. It resembles a S-64 Skycrane/Aircrane. Even the Skylift is addressed as unobtainable or not rideable, however, the helicopter can be obtained with a minor exploit involving stopping Yusuf in one of his missions by killing him and retrieving the Skylift but this trick is near-impossible to exploit.