1,2,3 PURCHASE! That is what a friend told me he recently did when he was booking a trip with a brother of his. The two of them wanted to take a trip together to NYC. When they searched online the fare was $279 round trip for one person but when they put in 2 the price went to $350 each. So they devised a plan where they would both pull up the same flight, add in their info, and then on the count of three they would click PURCHASE. The end result was not what they expected. My friends brother was the lucky one because he ended up with the $279 fare and my friend paid $350. He asked how could that have happened? "Inventory my friend", was my reply". Airlines limit seats on each fare level. Sometimes there is only 1 seat left and the lowest fare and sometimes the lowest fare only offers 1 seat at a time. I explained to him had he called me, I could have told him this from the beginning and potentially saved him the additional $71 he paid. As a travel agency that specializes in airfare, we are able to see in real time the airlines inventory on each fare level. In addition to this we can easily find the dates that have availability on the lowest possible fares saving the consumer painstaking hours of checking all the possible options. Lesson learned by my friend, he is going to call his agent next time.