The demonstrated x-wind limits as mentioned above will be from boeing.
All airlines do have their own operational x-wind limitations for the type they fly. These limits range between limits for take off and limits for landing for various runway conditions, ie: dry wet or contaminated (then usually split into limits for type/depth of contamination).
They may sound quite high when used to flying smaller a/c, but the jet will come down just as much sideways as any other plane, and a lot quicker!
