The Mumbai police have arrested a male passenger after a crew member of a Delhi-bound flight from Mumbai heard him talking about 'hijacking' on phone, an official said on Friday. It has come to light that the accused is mentally unstable and has been undergoing medical treatment since 2021, he said.

from Times of India https://timesofindia.indiatimes.com/india/mumbai-male-passenger-held-after-crew-overhears-him-talking-about-hijacking-over-phone-on-flight/articleshow/101215265.cms