Originally Posted by
jdrtravel
Transcon flights are US 48 like JFK-LAX, JFK-SFO, etc. However, I don't think the certs can be used in Delta One, they can only be used in Main Cabin, C+ and First Class.
Incorrect. They most certainly can be used on the Delta One flights that operate JFK-LAX (and the other west coast cities). Previously, they would book into I class, even when the much cheaper Z seat was available for sale.
This has apparently now been corrected.