The airlines did not allow some passengers to board the Rajkot-bound flight scheduled for around 5 pm from Delhi.
Confirming the incident, an Air India spokesperson said it was a "rare occurrence" and that only two passengers were affected.
They are being send to their destinations through an alternative flight. The passengers are believed to have protested the incident at the airport terminal, the spokesperson said.
"In this particular sector, 2-3 per cent extra booking was allowed and in this particular flight all the passengers reported for the journey, thus leading to this incident," the spokesperson said.
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