According to the Federal Aviation Administration of the United States of America, the decision is to enter into force on October 27 and will run until October 27, 2018, but "it can be changed if necessary."
The US aviation authorities believe that the tension in the region is still high, so they decided to extend the ban on flights for another two years.
The ban applies to all passenger and cargo airlines of the United States, as well as pilots with US licenses, except those who work for foreign carriers.
The bans were introduced as far back as April 2014 due to heightened risk of flights in the region because of the political and military tensions between Ukraine and Russia. In April 2015, the ban was extended for a year.