Chuck - it looks good.
Sailor - It's good, but like your last drawing, it's got a lot of drawing errors (I spent the better part of an hour cleaning up your drawing last time).
Zephyr - she was retired instead of being refueled IIRC. The irony is that she would have been cheaper to operate in the 70's than many of the conventional transports that stayed in service. She's up for eventual museum status IIRC
Edit, They all need a clean up. Don't worry, you guys are not the only ones that have this issue. It is however something to keep in mind and address as you draw: