And be aware that there are quite a large number of routings/carriers/aircraft that one might encounter in OW RTWs that don't offer first, so be careful when assembling your itinerary that you aren't overpaying for a number of business class flights. Or, in the case of AA in N. America, paying for FC seats when a DONEx would put you in FC anyway (2-class aircraft with no J.)

Added: Sort of repeating what Number_6 said - near-simultaneous posts.