No, the smaller one is throttle lever, which is rather useless in FS2 anyway given that most of the time you are either matching speed with something or flying as fast as you can, or staying still at zero speed. Analog throttle/speed control is not really very useful in games like FS2 IMHO. It gets important in more complex physically accurate flight sims where you actually need many analog axes to map to controls, throttle, propeller pitch, flaps and fuel mixture. I personally nearly never actually use the throttle, I just hit full throttle, zero throttle, match speed or afterburners.