Searching BF Upgrade Availability for a Date Range
I'm wondering if there is a tool available that will allow me to search what fights have BF upgrade seats available (specifically, using a SWU).
1. Does such a tool exist?
2. Would that be a search for R class availability?
3. Is it possible to search over a range of dates (e.g. "What flights have upgrade seats available from March 1 to April 1, between EWR and LHR?")
Thanks!