Used to handle that, not sure why not anymore. I'll definitely fix it up. I'm planning on making it so that it tries to guess what you mean (essentially first auto-suggestion) if you don't click on it.
It also makes it hard to disambiguate cities/airports. Entering "Portland" brings up two entries named "Portland, United States" (presumably Oregon and Maine) along with "Portland, Australia", but no way of telling which Portland in the U.S. is which.