Expedia now seems to be giving until the end of the next "business day" for free cancellation as part of their "free 24-hour cancellation" policy. I booked a ticket TLV - NYC on Friday morning Jan. 9 and my Itinerary said "free cancellation until Monday Jan. 12 11:59pm PST" (see attachment). Dan has noted this about Priceline during the holiday season. However, I haven't found any benefit with Priceline over Expedia. They have the exact same cancellation policy as Priceline, and they also have a rewards program (although not very valueable when booking a flight only without a hotel). But most of all, Priceline does not have the option of searching for fares for infants. When checking out they ask you how many "unticketed infants" there are. But there is no way of getting any price quote b4 entering cc info.