Oops.. accidentialy deleted my reply to your post. Can you still see it (in your mail)?
Wel short summary of my reply: The popup Untitled.png says: Please enter: airport of departure; airport of arrival, departure date en return date.
Popup Untitled2.png says: Please enter airport of departure and airport of arrival.
So I think to problem lays in the fact that when you type in a airport name, you do not really enter it in the form (yet). If you typ "Ams" in the from (= Van) form a drop down menu with "Amsterdam (AMS) - Nederland" will appear. As soon as you click on it, the airport name will be entered in the form.
I tried to click on this by using the Action event. With de parameter "keydown" I was able to show the dropdown menu. But I was not able to click it. Is it possible to click on the name it suggest or is there a workaround?
Thank you in advance.