This aircraft (from Republic) flew for NW from 1986 to 2007.  A cold afternoon at LGA with some poor light but must have been one of the last sporting the "Northwest Orient"-style colours, hence the picture.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/130275500@N02">G B_NZ</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/130275500@N02/24856431226/">Northwest DC-9-30 N922RW at LGA</a>