I have it and have had no issues with it at all. I love it. I don't get to shoot too many aircraft, but have liked the results where I have. If you are close to the airport, it should work well. I don't think it would be good for real long-distance shots, but for moderate to close, it should work well. It is also a great lens for many other uses.
Here is a shot that made it here.
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Photo © Charles Frank
There are more shots here, many of which were shot with the 70-200L F4.
[Edited 2005-02-02 04:09:04]