nbevan

The reason for a cheaper prices on other sites is usually that they are better at finding routings with the lowest fare. The current lack of sorting on aa.com can also make it difficult to identify the lowest fare. Prices found can also be very sensitive to the specific times that are specified in the search. The lowest fares can usually be found on matrix.itasoftware.com, which searches the widest range of times and routings.

But there is very unlikely to be any difference when comparing itineraries with identical flights, except for multi-segment routings that have married segment restrictions that other sites can sometimes circumvent and book into a lower fare class on a segment by segment basis.