Lloyd brings Henry to the airport, where they take off in a small plane while being pursued by gunmen in episode #704 "No Country for Two Old Men".
The crew transports their prisoners to the airport for transfer to A.R.G.U.S. custody when they get free in episode 1x22 "Rogue Air".
Barry tests his powers with the S.T.A.R. Labs team in pilot episode. Barry practices more skills at the facility in episode 1x10 "Revenge of the Rogues".
Mick Rory & Leonard Snart are rescued when they are being transported to the prison in episode 1x10 "Revenge of the Rogues".
Heat Wave & Captain Cold rob a plane arriving at the airport in episode 1x10 "Revenge of the Rogues".
Barry has the assembled teams gather at a disused S.T.A.R. labs facility to train for the battle against the Dominators in episode 3x08 "Invasion!".
Oliver, Diggle, Felicity, and Merlyn get on Ray's plane to head to Nanda Parbat in episode 3x20 "The Fallen".
Oliver heads with his team to Russia where he arranges to meet Anatoly at the airport only to receive a less than warm welcome. The team returns to the airport to thwart General Walker's weapon sale and recover the nuclear bomb in episode 5x12 "Bratva".
The Legends face off against the Pilgrim in an abandoned facility in episode 1x12 "Last Refuge".
The assembled superhero teams regroup and plan their next move to fight the Dominators in episode 2x07 "Invasion!".
Sara, Ray, Barry, and Oliver head to meet the new President but are confronted by the Men in Black instead in episode 2x07 "Invasion!".
SG-1 tracks the second Stargate and stolen Touchstone to a secret N.I.D. hanger in Southern Utah in episode 2x14 "Touchstone".
The Hindenburg is destroyed upon landing in New Jersey in pilot episode.
Wyatt and Rufus head to the airport in an attempt to intercept Claire Gilliam to save Wyatt's wife's life in episode #113 "Karma Chameleon.
Source: What's Filming