Originally Posted by
ORDnHKG
AC 142 used to be 333, I had asked other FTers, that flight hardly ever use 333. I think OP also mentioned its 77L got swapped to 321.
Used to be? It still is. Define "hardly ever"? I work at AC and can tell you 90% of the time it's still 333 barring any last minute substitution. Let's not exaggerate here - 90% is not 'hardly ever'. AC142 for the month of Jul is not 333 but AC1166 is. It's scheduled, not a sub. AC142 is a domestic flight so we are not obligated to use a 333 for the duration of the year.