Airline upgrades are awarded to passengers based on available space, frequent-flyer status and the fare paid.
Increase your chance of getting an upgrade by using one airline for all of your travels.
Be friendly to the ticket agent. They are required to follow certain procedures, but a little friendliness might help and certainly couldn't hurt.
Ask the ticket agent casually whether there are any seats available in first class.
Trade in frequent-flyer miles for an upgrade, if you have miles.
Check to see whether your frequent-flyer program offers special upgrade deals. If the flight isn't full, the agent might upgrade you when you check in.
