It also pays to clear you cookies etc. on your computer if you have searched for airfare a number of times. I don't if JB does it, but it is said that some airlines use cookies to adjust prices just for you. So if they know you have looked at prices a few times they may raise them just for you to get you to buy. So say you find a flight for $150 and check it a few times before you purchase. Then the next time you go on the check the price is up to $165. But if I check at the same time you are I see the original price of $150. I have never seen JB do this but you never know.