There are only a few bizjets with straight wings right through the middle of the fuselage, so it should not be hard to recognise the Jet Commander and its derivatives. Only the Hansajet has a similar wing attachment, but forward swept wings.

Furthermore the heritage of the Aero Commander model 500/680 is clearly visible in the Jet Commander, in particular in the tail, fuselage close to the ground (and thus short nose gear) and cockpit windows. Other particular recognition points are the main landing gear retracting outwards and the eyebrow cockpit windows.

After the sale of the production rights to Israel Aircraft Industries (IAI) the latter company further developed the bizjet as the Westwind.

To differentiate between the different subtypes you have to look at

• the presence of tip tanks
• the presence of thrust reversers
• the shape of the engine nacelles
• the presence of winglets 

Three sub versions of Model 1121 have been built that basically only differ in engines (but all General Electric CJ610s) and performance, so they cannot be easily recognised externally. The 1121A is supposed to have different wheels and brakes, but the difference it not obvious. The Jet Commander 1121B has thrust reversers as option, so if you see a Jet Commander with them, it surely is a 1121B.

When IAI took over Jet Commander production of Aero Commander (actually Rockwell) in 1967, there were still a few aircraft under construction. These were delivered as Commodore Jet.

IAI immediately began developing its own version of the Jet Commander, which was called Westwind I. Compared to the Jet Commander, the Westwind has a longer fuselage and tip tanks. Especially the latter make it recognisable from the Jet Commander

The Westwind I with TFE731 turbofan engines received designation Model 1124 and marketing name Westwind II. These engines have a larger diameter than the original CJ610s, which is thus where you have to look at.

The last version of the Westwind was the Westwind IIA which has large winglets on the tip tanks. Furthermore it does not significantly differ from the Westwind II.

Especially for maritime patrol IAI built the Sea Scan, based on the Westwind II. Compared to the Westwind II it has various pods for surveillance equipment.