I am looking for a good website where I can book by fare code by Airline esp for upgrade purposes. ACs own site is not interactive enough, as are most, they only provide cheapest and most expensive. It is hard to book special fares like H or M.

Any ideas where I can find such a site.

A good site to check fare availability (but not to book a special fare code) is www.flyaow.com/classavailability.htm

Give it a try but I am looking for more than it can provide.

Happy miles.