Skylift
The Skylift is a very large heavy-lift helicopter featured in Grand Theft Auto IV's episode The Ballad of Gay Tony. It resembles a S-64 Skycrane/Aircrane. Even the Skylift is addressed as unobtainable or not rideable, the helicopter can still be obtained with a minor exploit involving chasing Yusuf and retrieving the Skylift after one of his missions but this trick is difficult to exploit. When trying to get the Skylift, you will have to do the Sniping Trick. Some Youtube videos explains how to obtain it. [1]
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