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". Cisco gathers the team at the old testing track where he attempts to bring Barry back from the Speed Force in episode 4x01 "The Flash Reborn".
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!".
Lyla briefs the President on what A.R.G.U.S. knows about the Dominators but then the President is abducted by the aliens 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".
Oliver and Merlyn attack the A.R.G.U.S. agents to release Chase in episode 5x22 "Missing".
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!".
Jax supervises Stein as he works on a reactor for Thawne. Later the Legends head to the facility to stop Thawne from destroying the spear in episode 2x16 "Doomworld".
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