Iran Air flight IR-721 had to return and make an emergency landing at Tehran Imam Khomeini International Airport, Robat Karim, Iran, on May 27th.
The Airbus A300-600 flying to Frankfurt, Germany, had to return due to an unusual odor aboard.
The plane landed safely.
No one was injured.
The airline arranged a replacement plane for the passengers.

Fly Jamaica Airways flight OJ-256 had to return and make an emergency landing in Georgetown, Guyana, on November 9th.
Air Canada flight AC-942 had to divert and make an emergency landing at John F. Kennedy Airport, New York, USA, on March 2nd.
United Airlines flight UA-4958 made an emergency landing at University Park Airport, Pennsylvania, on December 28th.