Prabhu said he was 'extremely pained by the unfortunate accidents, injuries to passengers and loss of precious lives'.
Gaikwad was travelling from Pune to New Delhi when the scuffle broke out over the sitting arrangement.
Paving the way for Air India's entry into the largest global airlines' grouping, Star Alliance today unanimously decided to recommence the national carrier's integration process that was suspended in 2011.
Pusapati was given detailed presentations on various aspects of the sector by senior officials of the Ministry.
"Unless he tenders an unconditional apology to AI employees, and undertakes in writing to abide by the Chicago and Tokyo Conventions & Rules of the Air and follow all cabin safety and public behaviour norms, we must not let him on board," says the letter.
'It is not as bad an airline as it is made out to be: We serve wonderful food, the leg space is more, our cabin crew is warm and friendly.' 'The customer needs to be apprised of these things.'