Denver Emergency Landing
Republic Flight 1557, operated as Frontier Airlines lost pressure and dropped from 24,200 to 28,600 feet over Aspen, and returned to Denver where it made an emergency landing.
The cabin did not depressurize and the oxygen masks did not descend, but the crew descended to deal with the cabin pressure issue.
The ERJ-190 made a safe landing with all of the 98 passengers and 4 crew uninjured.
Passengers were provided alternative flights from Denver to San Diego.