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a biz class ticket DONEW3 should be able to let you fly F in NA (booked in A class).
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In the latest rules i got last week (July 25th) it now states that "WHEN THE CLASS OF SERVICE FOR THE FARE IS NOT OFFERED BOOK IN THE NEXT LOWER CLASS OF SERVICE". This means that for most domestic flight (except the Transcon flight that offer business class) you will be booked in M class.