Originally Posted by
DaDaDan
The method mentioned above is accurate. Try to make a dummy booking for Y or higher fare class. One thing not mentioned is that you should check the "refundable" box. This will (generally) prevent the system from showing you A fares since while they are higher than Y and may be cheaper, they are not usually refundable. You'll then be returned itineraries with Y fares priced out and the availability of upgrades displayed.
OK, thanks!!
Edit: Arg! My next flight is BOS-LGA, which has
refundable A fares that are cheaper than Y fares. So A fares keep showing up when I search for Y. Does that mean this method won't work to check for V?