Frontier 737 pressurisation incident - Midway
 

AP reports:

"A Denver-bound Frontier Airlines flight returned to Midway Airport shortly after takeoff Thursday because of pressurization problems, authorities said.

Frontier spokeswoman Tracey Kelly said Flight 661, a Boeing 737 with 100 passengers and five crew members on board, experienced the pressure problems at 18,000 feet.

"The captain brought the plane down to 10,000 feet and the problems went away. But the oxygen masks over the seats had been released and were dangling in front of the passengers, so he returned to Midway,'' Kelly said.

Kelly said there were no injuries that required hospitalization, but the airline called paramedics to treat several people who experienced ear discomfort because of the sudden change in cabin pressure."