As many as 50 Air India flights will be delayed for an average duration of two hours till 8.30 pm due to the passenger service system (PSS) software shut down for six hours on Saturday, the state-run carrier said in a statement. Thousands of passengers across India and overseas stranded at several airports as the airline’s PSS software, which looks after check-in, baggage and reservation, stopped functioning. The software malfunctioned after a routine maintainance at 3.30 am. The software, which is run by SITA, was restored at around 8:45, due to which flight operations of Air India took a hit.