Air India said Tuesday an investigation was underway after a passenger found worms in his sandwich mid-flight. The passenger made the discovery during a flight from New York to New Delhi on September 28 on India’s struggling flagship carrier. The passenger reported the incident to Air India, but said he did not hear anything back for two weeks, according to the Press Trust of India. “We are investigating the caterer regarding this incident,” airline spokesman Prasad Rao told AFP in New Delhi. The spokesman said the airline maintained high standards, including hygiene conditions, adding that this was a “very rare incident”.