Airlines (except perhaps non-IATA) don't work that way.

We agree "Route Rebates" with selected businesses that promise a certain level of business. At the end of the year, (or quarterly for the larger corporates), the rebate is paid (which is only a percent or two anyway - no big deal unless your travel expenditure runs into millions of dollars!) If the travel spend hasn't been as large as that promised, the rebate doesn't happen!

Our discounted fares work in the time-honoured tradition of "the earlier you book, the less you pay". That way, Mum, Dad and Auntie Flo get exactly the same opportunity at purchasing cheap tickets as Sheikh Al Maktoum!