In a bid to woo more customers to its first and executive classes on international routes, national air-carrier, Air India, has offered a 20 per cent discount to senior citizens. An Air India press release said today that senior citizens , 65-years and above, are now eligible for a 20 per cent discount for travel in first and executive classes on international flights.The discount offer, however, is available only on tickets purchased from the airline's reservation offices in India and on the basic fare of market fares. The special discounted fares will be valid for out-bound travel commencing on or before March 31 next year.