The site continues to have issues.
For example, 3 or 4 times over the past couple of days, I've experienced this sequence of events:
- Search for a route and date (transcon, just after Christmas)
- See a decent fare (e.g. $399 for an "instant upgrade to Main Cabin Select")
- Select that fare/flight and proceed to booking page
- Insert personal information
- Get "We're very sorry but we seem to have encountered an error." message, then am clumsily dumped back to the home page.
- Conduct the same search immediately and see - for same date and flight - a $600 fare for Main Cabin, "unavailable" for Main Cabin Select (at any price) - even while the seat map shows several open MCS seats.
What a mess.