A traffic spike caused congestion in Portland, Maine, and the airport shut down for several hours.
More than 2,000 flights were canceled Tuesday after the airport’s traffic control system failed.
Portland Airport said the airport had a large volume of customers returning from a major winter travel event and a significant increase in traffic.
The airport reopened just before noon and passengers were allowed back in by 8 p.m.
The Oregonian reports the airport reopened at 10:35 a.m., a little after a 9:15 a.meters (2:15 p.metres) traffic delay that was due to the airport closing its terminal doors.
A flight was canceled for several minutes and then re-booked on the next available flight.
The flight landed in Portland at 8:22 p.ms.
The Portland International Airport had its busiest day in more than three months, according to a report by the Federal Aviation Administration.
It reported the airport handled 1,719,724 passengers in March and 2,739,000 in April.
It reported the largest number of passengers in the third quarter, with 3,829,715, or 56.7%, of all flights.
The Associated Press contributed to this report.