Well.....
When I finally reached a Continental operator, thay said they would honor the "H" fare. I really don't know the specific difference between Y and H, other than that my company's STUPID travel agent has to buy the lowest fare on some trips, and it's the one that's available when the 21 day advance fare is sold out.
As far as Platinum upgrades on this trip, NAB is the second biggest convention in Las Vegas, and all "F" class seats are gone already. If I don't want to wait at the airport, I have to buy Y or H to get an upgrade.
Dave