Sorry, if this has been asked 100 times, I even tried the embassy, but I get an error message. With 60 day visa exempt, can I go and come back once within the 60 days? This would NOT be a 'visa run', obvioudly, but just a flight to Vietnam for 2 days, in order not to lose my 'Flying Blue' frequent flyer miles by taking a short flight on a partner airline, and crediting the miles to 'Flying Blue'. Just one clear answer is all I need, thanks in advance.