An Envoy Embraer ERJ-175, registration N201NN performing flight MQ-3667 from Columbus,OH to Miami,FL (USA) with 68 people on board, was climbing out of Columbus when the crew stopped the climb at FL270 reporting problems with the cabin pressurization, descended back to FL240 and returned to Columbus for a safe landing on runway 10L about 50 minutes after departure.
The flight was cancelled. The occurrence aircraft was still on the ground in Columbus about 22 hours after landing back.