From Halopedia, the Halo wiki
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Skyjack (Skyjacker in Halo 3) is a medal awarded in Halo 3, Halo: Reach, Halo 4 and Halo 5: Guardians multiplayer (as well as campaign in Reach) for hijacking an aircraft (Type-26/54 Banshee, Hornet, Falcon, Wasp, or Phaeton). In Halo 3 and Reach it is represented by an eagle on a gold shield atop a bronze cross. In Halo 4 the eagle is atop a blue circle and a grey cross turned 45 degrees. In Halo 5: Guardians the eagle is on a yellow roadsign. As this medal is attained, a message appears on the screen, saying "You skyjacked (player's name)".
A good tactic to get this medal is to throw a Power Drain, or to shoot an overcharged Type-25/54D Plasma Pistol bolt or EMP grenade at an incoming aircraft. The aircraft will be stunned, leaving the player an opportunity to hijack it.
The Skyjack medal is the counterpart of the Hijack Medal, in which the player boards a land-based vehicle.