I've never used MS for airline tickets; I also find the price similar to the airline directly. And, because I do this all the time, I'm not sure that you can get any $$ adjustments if the airline runs a special. For example, I booked flights last year with USA and kept periodically checking back for better rates. On one occasion, it happened that they had discounted my particular class of ticket. My family saved $70 per ticket, in the form of a voucher for a future flight.