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.
Gulf Air flight GF-784 made an emergency landing in Peshawar, Pakistan, on April 4th.
The Airbus A330-200 plane flying from Bahrain was on approach to Peshawar when the crew reported an issue with the brakes.
The plane landed safely and was towed to the apron. All passengers and crew members remained unharmed.
American Airlines flight AA-192 had to divert and make an emergency landing in San Francisco, California, on September 20th.
The Boeing 777-300 plane was heading from Hong Kong, China, to Los Angeles, California, when one of the pilots suffered a seizure, prompting the crew to declare an emergency.
The plane landed uneventfully.
KLM flight KL-565 had to return and make an emergency landing in Amsterdam, Netherlands, on January 16th.
The Boeing 747-400 plane took off for Nairobi, Kenya, but had to turn back after a loose part was observed on a wing.
The plane landed back safely. All 376 people aboard remained unharmed.
Delta Airlines flight DL-1780 made a safe emergency landing at Fairbanks International Airport, Alaska, on June 27th.
The Boeing 737-800, flying from Seattle, Washington, was about to land when it encountered turbulence.
The plane landed safely.
One of the flight attendants sustained injuries.
A US military helicopter made an emergency landing at Kumamoto Airport, Japan, on April 20th.
Authorities said the crew decided to make an emergency landing after the UH-1 helicopter developed an issue with the engine cooling system.
The aircraft landed safely. No injuries were reported.
The helicopter belongs to the US Marine Corps Futenma air station.
Frontier Airlines flight F9-190 had to return and make an emergency landing in Denver, Colorado, on October 12th.
The Airbus A319-100 plane took off for Austin, Texas, but had to turn back after it hit severe turbulence that injured a flight attendant.
The plane landed back safely.