Flights to Orlando International Airport (MCO) were delayed for hours on Thursday night due to FAA staffing issues, according to the FAA's National Airspace System website.

The dramatic announcement is a stark indication of growing stress on air traffic controllers on the 30th day of the shutdown and a sign of mounting strain on U.S. aviation. Orlando is the 9th busiest airport in North America and serves millions of tourists and others annually in central Florida.

Passengers at Newark Liberty International Airport in New Jersey can expect flights to be delayed by an average of 40 minutes, the FAA said.

While the Federal Aviation Administration is facing an air traffic controller shortage, it’s testing a modern alternative to the traditional air traffic control system called a remote tower. The head of Johnston Regional Airport wants to be “first in flight” once this digital remote tower takes off.

The FAA is investigating an apparent close call at Logan Airport Thursday involving a Delta Air Lines flight that was landing and a Cape Air plane that was taking off.

A United Airlines flight from Chicago’s O’Hare International Airport clipped another United plane while taxiing at LaGuardia Airport on Friday evening, officials confirmed. No injuries were reported.

While Raleigh-Durham International Airport has seemingly avoided heavy delays due to the government shutdown, the people meant to keep people safe are working without pay. They missed their first full paycheck this week.