The following is based on Grand Theft Auto Vcut content and has not been verified by canon sources. Reader discretion is advised. Please do not add unverified or speculative content to this article unless confirmed by Rockstar Games or in-game data.
Michael plants bombs in the underground tunnel. He then stops a convoy and detonates explosives so a Harrier jet falls through the hole in ground and then steals it.
In-game, this mission most likely was named differently, and possibly involved stealing a Hydra as Rockstar does not use real life names for vehicles, and the Hydra is known for being the Harrier jet.
The fact that this mission was deleted was likely because the Hydra was replaced by the P-996 LAZER, and therefore would have been near impossible to land at the studio (considering that Solomon is the boss of this mission).