Despite the Altitude's recent success, the franchise experienced poor attendance with fans often numbering in the dozens despite a 5,000 seat capacity.

[4] Before the start of the 2005–06 season, the league announced expansion to the southwest United States with Tulsa, Oklahoma being chosen as a host city.

[7] Before the relocation of the Oklahoma City Thunder, the franchise had its final affiliations with the Bucks, Knicks, and the Dallas Mavericks during the 2007–08 season.

[8] On August 1, 2008, the newly relocated Oklahoma City Thunder agreed to purchase the 66ers for $2.25 million, becoming only the third NBA franchise to own a D-League team.

[9] After getting offers from four venues, Professional Basketball Club felt none were suitable and announced the 66ers would move to Oklahoma City and play in the Cox Convention Center across the street from the Chesapeake Energy Arena where the parent club Oklahoma City Thunder plays starting with the 2014–15 season.

[13] In 2021, the Cox Convention Center was leased to a film production company and the arena was closed to become Prairie Surf Studios.

Entering the playoffs as the third seed, the Blue defeated Rio Grande Valley Vipers in the first round in a 126–125 overtime win behind Ousmane Dieng's game winner.

Thunder assignment Ousmane Dieng was named NBA G League Finals MVP after scoring 25 points, 6 rebounds, 4 assists, and 2 blocks.