I took a photo of a United Airlines plane in Detroit in March 2004.
I'm wondering whether it is a Boeing 737 or Airbus 319 or 320?

You can see it here. http://www.ackle.com/ebayualphotos.htm
Scroll down to the bottom of the page to see it.

Any help with this is appreciated. I sell some United items on eBay
and I want to sell the photo, but don't know what it is.

Thanks.