Here's my take; I've owned the Nikon 55-200mm and got it for a holiday in the US as a back up for my Nikon 300mm f4. I sold it as its really not sharp especially at 200mm. I also sold my much loved Nikon 300mm f4 as as good as it is (and I might buy another copy in the future) the lack of zoom is a real pain. Yes you can still get cockpit shots if the aircraft is to close, but if you're faced with a once in a lifetime shot and your to close your screwed...
My main lens now is the Tamron 150-600mm which sells used for a round £625. Is not perfect far from it, and neither is the sigma alternatives, but the range of zoom range gives you a range of options and compositions. Also with the ISO performance on DSLRs f2.8 and f4 lens are less important for low light, but of great for narrow depth of field.
I normally use the Tamron with the Nikon D7200.
I also use a Nikon d5300 with the Nikon 55-300mm. Good combination, but the autofocus is slow and needs good technique/ practice.
My plan is to replace the 55-300 with a faster 70-200mm but largely as I live next to a commercial airport and can get away with a shorter lens for large landing aircraft.
My advice would be to go for a used Tamron 150-600mm or a used Nikon 55-300mm. The problem with the Tamron is that it won't be well balanced on the Nikon d3200. For a while I used the Tamron with the d5300, which worked just...
On Ken Rockwell, I've found his advice interesting and helpful and more often than not right. He seems to have a lot of haters because he does advice buying the latest and most expensive cameras and lens. One good example is that he rates the Nikon 55-300 over the 70-300 in terms of image quality (but not for sports where he rates the 70-300 better). Having previously owned the 70-300 and really not liking the image quality I can say he advice was right, the 55-300 is better but has slower autofocus.
Hope that helps.
PS
My Flickr uploads have tags for the lens used and you can see what the results are like...the Turkish KC-135 is with the nikon d5300 and nikon 55-300.
http://www.flickr.com/photos/leeadc