India, April 7 -- Campbell Wilson, the chief executive officer tasked with leading the Tata Group's ambitious overhaul of Air India Ltd., has resigned from the airline, Mint reported, citing people with direct knowledge of the matter.

Wilson is currently serving his notice period, said the people, who asked not to be identified as the information is private. It remains unclear when his tenure will officially conclude or if Tata Group has identified a successor for the nation's second-largest carrier.

A spokesperson for Air India did not immediately respond to Mint's email seeking comment.

The departure marks a significant leadership vacuum for the storied airline, which was acquired by Tata Sons Pvt. Ltd. from the government for Rs.18,...