Alaska Air Cargo operates some 737-700s that have been converted to freighters.  For some reason, I feel like I have struggled to get any good shots of them.  I have either been too distant or the weather was crummy or I just made a bad job of the shots.  They operate in and out of SEA daily so you would think that, after six years up here, I would have got something of them that I liked.  Finally I got a bit more lucky.  Some afternoon departures to the north on days when I could be there and the light was cooperating meant I was able to get something better.  The -700 is not a big jet so, even with the 500mm, I was stretching things a bit but winter light makes everything better.  If only the Cargo logo wasn’t hidden behind the wing for a good chunk of the time.  The low light does make the texture of the door conversion on the front of the fuselage show up, though.