What date specifically?

I note that EF, if you search for DOH-YOW on AC and TK, it only spits back AC results. But if you search for only TK it'll give results, but note in the routing rules it is (As bold as ASCII can bold):

**** CONSTRUCTED ROUTING DOH-YOW/TK EF-21SEP21 DIS-INDEF
**PUBLISHED DOH-YTO TARP/101 PUBLISHED ROUTING 2002
**ADDON DST YOW TARP/101 PUBLISHED ROUTING 2003

Ooh, even stranger, asking again for AC or TK the constructed routings are provided. Interesting. (thanks for the somewhat OT chance at EF archaeology). Tisk tisk. Lazy generator.

Back solidly on topic, its AP that is your agent in this case, which may be subtly different from AC as what AP is offered at the not-cash price is different than is available to the open market. (though, as demonstrated above, the open market doesn't publish that routing)