We actually do both, and then spent a few cycles de-duping etc. 1) Part of our reason for using Node+Socket.IO is to deal with the problem of having a bunch of

We actually do both, and then spent a few cycles de-duping etc. 1) Part of our reason for using Node+Socket.IO is to deal with the problem of having a bunch of different sources returning data over a wide spread of time. 2) You'd be surprised about the airline sites. While they don't necessarily have the widest variety of good fares, airline will often reserve their cheapest fares for their own sites (called Last Seat Availability).