(Phoenix, AZ) -- The skies over Phoenix may soon be quieter. The Federal Aviation Administration has reached an agreement with the city of Phoenix and some historic neighborhood groups. They'd filed suit over flight path changes they claim increased air traffic over some parks and neighborhoods by 300 percent. A federal appeals court ruled that the routes put into effect in 2014 violate federal laws. The court ordered the FAA to go back to the old routes. But the FAA said that would cause delays and compromise safety. In the new agreement, the FAA would temporarily go back to the old routes while getting public input to develop new flight paths. The FAA says the agreement will cut down on noise and airport delays. It still needs court approval.