Nice idea. I like the clean interface and it's very responsive. Nice comparison feature as well. I think you need some kind of canonical name resolution though.
For example, searching for 'Moscow' returns nothing -- but it is found as 'Moskva'. Also, nothing is returned for 'Nairobi', but it's there as 'Jomo Kenyatta International' which is their airport. Not exactly obvious.
Overall very nice work.