Qantas Airways will reap the benefits of its dramatic financial turnaround in the form of a lower interest bill, after Moody's restored the airline's investment grade credit rating. Monday Moody's upgraded its rating on the airline to Baa3, with a "stable" outlook, from the previous Ba1 rating. Standard & Poor's had already returned Qantas to investment grade in November, but the carrier needed the tick of approval from both ratings agencies to gain the full financial benefits of an investment grade rating. Qantas joins Southwest Airlines and EasyJet as the only 3 airlines globally to have an investment grade credit rating from both Moody's and S&P. There are estimates Qantas could ultimately save about A$50m on its interest bill annually as a result of the ratings upgrade. <br/>