In incident last year, staff made disparaging comments when Jewish travelers tried to avoid fee for exceeding hand luggage weight limit by 100 grams

Tehran retrieves some data from black boxes from jetliner accidentally downed by the IRGC in January, killing all 176 on board

Ukrainian aircraft was struck by two missiles and crashed shortly after taking off from Tehran airport on January 8, killing all 176 people on board

President Volodymyr Zelensky attends honor guard for Ukraine International Airlines flight crew and 2 passengers shot down January 8 by Iran's Revolutionary Guard

National security council official says additional possible causes under consideration include drone or other flying object crashing into plane, terror attack, engine malfunction

Iranian Civil Aviation Organization offers no immediate explanation for disaster; Ukrainian officials have backed off claim it was brought down by mechanical trouble

Canada's FM says he's in touch with Ukraine's government after passenger jet went down near Tehran, killing 176 in total

Amid speculation that accident was linked to missile barrage, Tehran officials insist engine trouble was the cause, but Boeing says 737 was in good condition with experienced crew