Using a MacBook Air with 27" HP Monitor

Our IT department bought an HP 2740w display for my MacBook Air because they didn't want to spend the money on a Thunderbolt Display.  The highest resolution I can seemingly get is 1440 x 900.  I'm SO disappointed.  Nothing (not even close) to the image I get on my 27" iMac at home.  OK, so I'll blame that on HP. (I think.) 
My question is this:  If I look at the specs for the MacBook Air (13") it says this:
Supported resolutions:
1440 by 900 (native), 1280 by 800, 1152 by 720, and 1024 by 640 pixels at 16:10 aspect ratio; 1024 by 768 and 800 by 600 pixels at 4:3 aspect ratio.
So, had we spent the extra money on a ThunderBolt Display, I would still only get 1440 x 900?  I simply can't believe that! 

Capt...
No, I'm not in Mirror Mode:
But it does concern me that the screen on the left (the smaller image) is the HP 2740.  My "guess" would be that should be the larger screen.
Here's another screen shot:
I don't know if that give you anymore information.
I really appreciate the help. I'd like to make this work, but if I can't get any bette resolution, I'll send it back.
Thanks!

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