How does a Boeing 737 look like at night from 2000 meters away?
At night, at that range, it will look about like a dot of light, probably with a red flashing beacon and white flashing strobe lights. 

That's what you'll see from essentially every aircraft at that range at night, unless the pilot chooses to turn off some or all lights. 

But you're seeing the LIGHTS, not the AIRCRAFT, at that distance, and the ability to visually identify what aircraft it is, is essentially nil.