The workhorse of the fleet.  Half cargo and half passengers. The "igloos" are an Alaska Air adaptation.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/11376383@N00">Joseph</a> from Cabin On The Road, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/umnak/6842543722/">737 400 Combi being loaded</a>