Authorities in South Korea were working on Monday to confirm the identities of more than three dozen of the 179 passengers who were killed when a Jeju Air plane crashed.

Passengers with the South Korean airline Jeju Air are canceling tickets after one of its aircraft crashed, killing 179 people The airline said that 68,000 flight reservations had been canceled as of 1 p.

Witness accounts support some experts’ theories that bird strikes damaged both engines, leaving pilots little time to react and forcing a desperate landing attempt.