It took the airline industry 10 years to get back to where it was (in worker numbers, https://skift.com/2018/09/14/10-years-later-how-the-travel-industry-came-back-from-the-financial-crisis/) after the 2008 recession. Even so, business travel never really fully recovered, with most air sector jobs going to the budget carriers. Beyond COVID, business air travel seems unlikely to recover in any meaningful way.