Aengus Kelly, CEO and Executive Director of AerCap.

AerCap Holdings rocked the aviation world last week with a $30 billion deal for General Electric's aircraft leasing arm, General Electric Commercial Aviation Services, or Gecas. For GE, it marks CEO Larry Culp's latest move to slim down the conglomerate, raise cash and pay down debt. After the deal closes the remnants of GE Capital will be folded into the main business. GE would have a 46% stake in the combined company.

For aviation, the deal would combine the world's two largest aircraft lessors into a behemoth with even more power to negotiate prices with manufacturers like Airbus and Boeing. Together, the two companies would own or manage some 2,000 aircraft, roughly doubling AerCap's fleet. They would also have about 5% of aircraft manufacturers' backlog, Cowen & Co. analysts said. They have more than 200 customers combined and just around 70 of them overlapping, they said.