Three flights carrying 674 people, mostly students, evacuated from the conflict-ridden city of Sumy in northeastern Ukraine landed here on Friday, with the returnees recounting the horror they went through and how they survived the war for two weeks. Two aircraft with 461 people -- one of Air India and the other of IndiGo -- arrived at the Indira Gandhi International Airport at 5.45 am and 12.20 pm while the Indian Air Force's (IAF) C-17 carrying 213 passengers landed at the Hindon air base at 12.15 pm.