Was just researching the reason for AC7 being delayed by almost 5h today, and came across this:
AC0093/29DEC EQU ACA77WH01
RMKS/AWAITING LATE INBOUND AIRCRAFT WHICH WAS DELAYED EX YYZ FOR GROUND HANDLING CHALLENGES DUE COLD WXXFLT DLYD DUE LATE INBOUND FLT AC93 FROM EZE ACCT UPLINE DELAYS FROM YYZ ON AC92 WITH COLD TEMP AFFECTING GROUND OPS
wrt cold weather, I'm curious, how far "UPLINE" is uncontrollable for airlines?