It's already there - (removed - ineffective link - my mistake everyone! )
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One concern I would have about this suggestions is that some forums, where airport codes are used regularly (like the mileage run forum) would be overrun & harder to read with all those mouseovers. Personally, I'm not a fan of mouseovers & I think it's worth the extra 15-30 seconds to google the airport code & find out what it is instead of having all those mouseovers...