▁was ▁a ▁flight ▁from ▁M ash ad ▁Airport ▁to ▁Te h ran - Me h rab ad ▁Airport ▁that ▁crash ed ▁on ▁January ▁ 2 1 , ▁ 1 9 8 0 ▁during ▁its ▁approach ▁to ▁Te h ran - Me h rab ad ▁run way ▁ 2 9 ▁in ▁fog gy ▁and ▁snow y ▁weather ▁conditions , ▁killing ▁all ▁ 1 2 8 ▁people ▁on ▁board . ▁At ▁the ▁time , ▁Iran ▁Air ▁Fl ight ▁ 2 9 1 ▁was ▁the ▁dead liest ▁aircraft ▁dis aster ▁in ▁Iran ian ▁history . ▁ ▁A ircraft ▁ ▁The ▁aircraft ▁involved ▁was ▁Bo eing ▁ 7 2 7 - 8 6 ▁with ▁registration ▁EP - IR D ▁( factory ▁no . ▁ 1 9 8 1 7 , ▁serial ▁no . ▁ 5 3 7 ) ▁was ▁built ▁in ▁ 1 9 6 8 ▁and ▁made ▁its ▁first ▁flight ▁on ▁February ▁ 1 7 . ▁The ▁aircraft ▁was ▁power ed ▁by ▁three ▁Pr att ▁& ▁Whit ney ▁J T 8 D - 7 B ▁tur bo fan ▁engines . ▁ ▁Acc ident ▁ ▁On ▁the ▁day ▁of ▁the ▁accident , ▁Iran ian ▁air ▁traffic ▁controllers ▁went ▁on ▁strike , ▁which ▁led ▁to ▁hundreds ▁of ▁domestic ▁fl ights ▁being ▁cancel led . ▁Then ▁at ▁ 1 6 : 0 0 ▁the ▁strike ▁was ▁interrupted , ▁and ▁fl ights ▁res umed . ▁At ▁ 1 7 : 4 0 , ▁Fl ight ▁ 2 9 1 ▁depart ed ▁from ▁M ash ad ▁Airport ▁bound ▁for ▁Te h