Boeing's entry was essentially identical to the swing-wing Model 733 studied in 1960; it was known officially as the Model 733-197, but also referred to both as the 1966 Model and the Model 2707.
Boeings forslag var grundlæggende det samme som designet til model 733 med variabel pilgeometri, som var udarbejdet i 1960, det blev officielt kaldt model 733-197, men var også kendt under navne som 1966 model og model 2707.