Iran's airline industry - like so many industries in the country - is hit by sanctions. So Iran has worked at developing its own planes and has been successful.
However, four planes have crashed in the last 12 years, which has grounded the indigenous industry.
Watch: http://www.aljazeera.com/programmes/countingthecost/2014/09/grounded-iran-air-industry-20149616420391457.html
