In response to TrayFlowInUK's question dated June 13, 2011, there is a way to complete the same types of inquiries using our advanced routing codes. The reason it did not work for him the first time is because the syntax has changed from that which the original user posted in 2004. To complete these types of searches, please use the following:

To constrain results to return YUP fares only
Using BOS as your Departing from point, enter the following syntax in the advanced routing code field "/ f ..yup" (without the quotes). Using LAX as your Destination point, enter the following syntax in the advanced routing code field "/ f ..yup" (without the quotes). Enter your preferred dates, times, number of travelers, etc. and hit search. Results should appear shortly.

To constrain results to return either YUP or F fares on any airline and between any points
Using BOS as your Departing from point, enter the following syntax in the advanced routing code field "/ f (.bos+lax.)|(..yup|..f)" (without the quotes). Using LAX as your Destination point, enter the following syntax in the advanced routing code field "/ f (.bos+lax.)|(..yup|..f)" (without the quotes). Enter your preferred dates, times, number of travelers, etc. and hit search. Results should appear shortly.