Using airport hashtags on twitter for travel destinations or businesses near an airport can have its advantages. Airport hashtags are short, which means you can fit more of them on a tweet. You need one space, one hashtag and a three digit airport code, and you are done.
The problem I experienced is that airport hashtags do not pick up fast traffic like more heavily used hashtags. The other problem is that the airport terms pick up a lot of irrelevant traffic as well.
Changi Airport in Singapore is regarded as one of the best airports in the world. You can shower, nap, see a movie, drink wine, enjoy Chinese dumplings, see an indoor lake, and more. But, the hashtag #SIN is very sinful! You’ll get the wrong type of followers. Then Bombay airport is #BOM, that didn’t attract good people either. I tried #KUL which didn’t get me anywhere, but at least didn’t have all of the nonsense tweets using that combination of letters.
It is a little too early to judge if airport hashtags are a good idea to use for travel tweets!
For now, my vote is against them unless you use only one airport tag when blogging about that specific airport!