Alan,
The following all have WFU or similar in the airline name but seem to still be flying:-
3C496A EWG8XG EGLL-EDDK D-ABKJ B738 WFU Stored (ex TU...
3C6515 DLH425 KBOS-EDDM D-AIHU A346 WFU Stored (ex Lu...
478772 NOZ4ES ENGM-GCLP LN-DYU B738 WFU Stored (ex No...