A United airlines flight had to return and make an emergency landing at Tucson International Airport in Arizona, on February 7th.
The plane, operated by SkyWest Airlines, took off for Los Angeles, California, but had to return shortly afterwards after the cabin filled with smoke.
The plane landed uneventfully. All 73 passengers and 4 crew members were safely evacuated.
The FAA is investigating.

Thomas Cook Airlines flight MT1054 had to return and make an emergency landing in East Midlands, England, on July 9th.
American Airlines flight AA-4672 made an emergency landing in Montgomery, Alabama, on December 1st.
Etihad Airways flight EY-474 had to return and make an emergency landing in Abu Dhabi, United Arab Emirates, on September 5th.