The flights on major airlines that weren't working (AC, BA) are at least now returning a result. Although for some reason it's inconsistent - e.g. the one I previously reported lists the aircraft as "Boeing 737 MAX 8 (7M8)", whereas other AC-operated flights just say "7M8". Same with AC327 YUL-YYC 9/11/25, which yesterday was also generating an error; it now works and returns "Airbus A220-300", while other AC flights say "223".

But it also appears that the new version of the site only returns one error when an aircraft change alert fails. For instance, with airlines like DM or SI that don't make seat maps available, it returns the same generic "Failed to create alert Please try again, if the problem persists contact support". Before the switch to the new site, it would reject the alert with a message that seat maps were not available for this airline.

I'm still not sure why a seat map is necessary when the flight schedule alert shows the type though...

(Although I'll note that the new site at least seems to have done away with the never-ending aircraft "change" alerts that were triggered by European carriers constantly adding or subtracting a row of intra-Europe business class, which is a very welcome change - I care whether the aircraft is a 223 or a 320, not whether AF is selling 3 rows of J one day and 4 rows the next, or vice versa).