I agree with the above posters. Your shots will look a lot better when dropped down to 1024x768. If I am not mistaken, that seems to be the norm as far as sizes go around here. The first shot could use a little bit of sharpening around the tail along with an adjustment in the contrast and colors. It looks like with some work that you could definitely get that one uploaded to the database. With the CRJ, you might be out of luck with that one. Just make sure to keep shooting, the more shots you take the better your chances of getting a clear one are.
When I do my post processing, I do major adjustments (color, levels, heavy sharpening, etc) at full size and then scale down progressively doing less work at each size. By the time I am at 1024px, my shot is looking pretty good. I am sure there are other methods people use on here, but there is a suggestion to get you going. Best of luck!