If you want to use it for taking piccies of airplanes then the Sony Mavica fd91 is the only one available at a reasonable price with a decent zoom. It has 14 times optical zoom. Most of the opposition only has 2x or 3x optical. Ignore any reference to digital zoom, it is really only a "cut and paste" function which produces low resolution images.
The fd91 has the additional advantage (or dis-advantage, depending on your viewpoint) of recording directly on to floppy.
Biggest disadvantage is the fairly low resolution, only 850k pixels. This is fine for displaying on a pc/laptop and for publishing to the web, but a little low if you intend to print the results. Better off going for one of the new generation megapixel 1.5 - 2.5 million pixel cameras in that case. Most of the CLK photos on y site
http://home.netvigator.com/~pashford were taken with my fd91.