India, Jan. 15 -- A Delhi-bound IndiGo flight from Tbilisi, Georgia, narrowly made it through Iranian airspace just before Tehran abruptly shut its skies, aviation data and airline statements showed - underscoring how the sudden closure has thrown international flight operations into disarray.

IndiGo flight 6E1808, which departed Tbilisi late on Wednesday night, passed over Iran at about 2.35 am on Thursday and landed in Delhi at 7.03 am, according to real-time tracking data from Flightradar24.

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The aircraft is believed to have been the last non-Iranian commercial plane in the air before Tehran's aviation authorities issued a Notice to Airmen (NOTAM) suddenly closing most of the country's ai...