Currently there is a dedicated 727 sports charter sub-fleet used for those NBA and NHL teams that NW has under contract. They have special interiors for these charters they have not used in the regular passenger fleet during the NBA and NHL seasons. In the past, at the conclusion of of the NBA and NHL seasons in the spring, the 727's would be converted back into to passenger configuration for added capacity during the summer months.
NW has ended the contracts with NBA and NHL teams as it stands now at the conclusion of the 02-03 season with the sports charter 727's will be retired. Currently NW still has 1 remaining DC-10-40 that is solely doing charter service.....for NFL teams, military, and special groups. It will be retired, along with the other DC-10-40's that were retired at the beginning of September from passenger service. NW regularly uses 757's to do College Football and NFL charters. They also have 1 747-200 N613US that solely does charter service, again for NFL teams, college bowl games, military, special groups, etc.
Since the contracts were not renewed, these teams will have to look elsewhere. Whether or not NW will let them to do charters with regularly configured passenger aircraft is yet to be known. However there will be no special aircraft in a more luxurious configuration for the teams use.