Air travel disruptions mounted across the US as lawmakers pushed to end the federal government shutdown, with an air traffic controllers’ union warning of “the erosion of safety” as the critical workers missed their second-straight full pay cheque.

Almost 2,100 flights were cancelled as of 6:15 p.m. in New York on Monday, according to data compiled by aviation analytics firm Cirium. That’s about 8.2% of the day’s 25,735 scheduled flights.

Chicago O’Hare International Airport had the most cancellations, with nearly 25% of its scheduled flights scrapped. Over 16% of services in and out of Boston Logan Airport were scrubbed, as were 15% of trips at New York City’s LaGuardia Airport.

The growing fallout stems from the Federal Aviation Administration’s directive to reduce flight capacity by

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