Originally Posted by ContinentalFan
It does look like the front cabin is selling well this year. At least, I haven't had luck upgrading on H fares on domestic trips. I have bought two H fares this year, but neither was able to upgrade. I bought the tickets about a month before the flight; last year, I bought tickets four or five months before departure. Though I have noticed a greater availability of Z fares this year compared to last--a Z isn't that much more than an H!
These days, I can't imagine buying a higher fare class for a domestic trip in the hopes of increasing chances for an EUA or success using a mileage upgrade (I tend not to use domestic mileage upgrades anyway - prefer to save the miles for more expensive rewards). Why not just buy a Yup or Z if available - they're usually not much more expensive than Hs?