From our friends at
Expert Flier:
Discounted Domestic First class. A class of service are commonly HUP and QUP fares basis, making this fare technically an "upgraded" fare. Why is this important to note? Let's say you get rerouted, or there is a schedule change and you are booked in a flight where no more First class fares are available. You would not be eligible for compensation or partial refund as getting into First class on this fare is contingent on the space being available when booked. It is technically a coach fare. This makes it relatively important to book yourself a seat assignment when travelling in A.
Now I apologize for the latter part, even though what I said was plainly clear:
Meaning, he had to fly coach across the pond if he wanted to get there the next day
OR
wait three days for any J inventory to open up
zz