Maybe you should say something to indicate you are looking for cities and not countries. I typed in Canada, Mexico, France, the UK, United Kingdom, England, Germany and then gave up thinking that there must be something wrong with the quiz. Other than that... interesting idea for a quiz.
Another thing... most of these are cities but then you have "Bahrain"- which is a country. You should at least add "Manama" as a type-in, and/or Hidd/Arad which is where the airport is that services Manama now, not sure if it's in the same place as it used to be.
I should have known Dhahran. I knew TWA worked with Aramco. That's where their headquarters is, even though nothing else is there.
I should have known Dhahran. I knew TWA worked with Aramco. That's where their headquarters is, even though nothing else is there.