Some tips on getting a free flight upgrade
well its not easy but sometimes it works
try the following :
they not going to give you an upgrade if you are wearing cargo shorts, a tank top and flip-flops.
Be on time
make the request with plenty of time to spare before the flight.
Dont be demanding
Being overly demanding, just inspires agents to pick someone else to upgrade.
Flight is empty, your chances are slim
Even though seats in business class may be empty, the airlines don’t usually upgrade people for no reason. If the flight is full, your chances are better. Therefore, on a full flight the airlines sometimes are forced to upgrade people.
Solo Travelers - The odds are best for those traveling solo who are sometimes reseated up front in business to accommodate families sitting together in economy.