NEW DELHI, April 10 -- An Indian national has been placed on Air India's no-fly list for a month after allegedly urinating on a co-passenger while seated in business class on a flight to Bangkok.

The incident occurred on Air India's AI-2336 flight from Delhi to Bangkok on Wednesday. According to people familiar with the matter, the passenger immediately apologised for his behaviour.

Internal documents identified the victim as Hiroshi Yoshizane, managing director of Bridgestone India, who has not yet pressed charges.

An Air India spokesperson confirmed the "unruly passenger behaviour" on flight AI2336 on April 9.

"The crew followed all laid-down procedures, and the matter has been reported to the authorities. In addition to warning the...