Boeing NB-4 Naval Trainer, Landplane Version 

Boeing NB-1, Model 21 Trainer, on Lake Union 

NB-1 Floatplane on Lake Union 

VNB-1, Model 21 Floatplane Prototype, on Lake Union 

Boeng NB-3 Naval Trainer 

Boeing NB-1, Model 21 Naval Trainer, Docked at Lake Union 

Boeing NB-1, Model 21 Naval Trainer, on Lake Union 

Boeing NB-1, Model 21 Naval Trainer, Docked at Lake Union 

VNB-1 Floatplane Prototype for the Model 21 on Lake Union 

Boeing NB-3 Naval Trainer at Sand Point