The burden of vaccination checks could weigh on airlines already hammered by the pandemic: Big carriers warned just last week their business could be off by 30 percent of normal by the start of fall.

Conor Cunningham, a senior travel industry analyst at trading firm MKM partners, said a vaccine mandate would be a “logistical nightmare” for airlines and the Transportation Security Administration — and told The Post that a requirement would lead to “a lot of cancellations.”

“The experience at the airport would already go from being really, really awful to even worse,” Cunningham said, arguing that many airports and airlines are understaffed and that making workers check vaccine cards would be an additional burden.