Bhubaneswar: October 2: Biju Patnaik International Airport at Bhubaneswar, Odisha has started 24 –hour operation as two flights landed on Saturday night. Sources said two flights of Indigo airlines- Kolkata-Bhubaneswar and Delhi-Bhubaneswar- landed at Bhubaneswar airport at 10.05 pm and 12.30 am respectively. Both flight resumed journey for their next destination on Sunday morning. For Kolkata, the flight left at 5.55 am whereas Delhi flight left at 6.05 am.