Originally Posted by https://www.cbc.ca/news/world/iran-ukraine-air-crash-canadians-tehran-1.5418610

Within hours of the missile strikes, the Federal Aviation Administration barred U.S. carriers from airspace over Iran, the Gulf of Oman, and the waters between Iran and Saudi Arabia, citing "heightened military activities and increased political tensions in the Middle East, which present an inadvertent risk to U.S. civil aviation operations."

The flight ban came shortly before the Ukrainian International Airlines flight crashed.

Transport Canada had previously said it was "monitoring the situation closely in the Middle East and are in close contact with the U.S. Federal Aviation Administration."

It said Air Canada, the only Canadian carrier to operate in the affected area, "has altered its routes to ensure the security of its flights into and over the Middle East."