After reading all this, I still don't know if I should board AC34 when priority boarding is called in about 45 minutes. Flightstats shows six seat in J (AC seating chart shows 5 seats unassigned). Couldn't get any info on checkin as to where I am in the queue (no surprise). Don't mind waiting, but I sure don't want to have to put my bag under the seat in front of me in Y for a 14 hour flight.