"People want to get back face to face because we have all figured out Zoom is fine, but it doesn't really make it happen," Domhnal Slattery, chief executive of aircraft lessor Avolon, said at the show. As demand begins to bounce back, there are growing concerns about cost inflation and difficulties in the supply chain, for both commercial and defence manufacturers. "There is a general labour shortage and the only way to get labour back to work is higher rates," said Kailash Krishnaswamy, senior vice president of aftermarket services at Spirit AeroSystems SPR.N.