Thank you everyone. Personally, I try to avoid cropping parts of the aircraft if possible. If you were to browse my collection of photos on this site, you would find that I generally stick to the same type of crop from this and similar angles. Like someone said above, each to their own.
The 737-700 can seem very awkward at times with certain crops due to its proportions. But I purposely cropped the way I did so that the sky and some of the lit city skyline would be visible in the background. In my opinion, those elements are what make this shot worth uploading, especially since I already have two shots of this aircraft in the database.
Thanks for your help. It seems the general consensus is that the centering is ok. Lets hope the screeners agree. I will leave it in the queue.
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.