This is from their web site: What does Zone 5 mean on Air Canada? Answer: Zone 3 for window seats, Zone 4 for middle seats, and Zone 5 for aisle seats if you do not have status or purchase Comfort fare or above (or Basic, which goes to Zone 6).
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Zone was started when LH imagined they would do something that resembled priority boarding. So window seats at the back of the plane were labelled Zone 1, then middle seats Zone 2, Aisle seats Zone 3 etc for that rear section of the plane. And an aisle seat in the front of the plane would be zone 5 or 6.
People, otherwise without elite status, who paid for early boarding. Everyone else, sometimes sorted by their row of the aircraft. If you don't fit one of these, you're likely to be towards the bottom of this list. Check your bag and it doesn't matter so much, assuming the airline has assigned seats.
However, even in general boarding, there are clear queues: Group 5 (Preferred Boarding): Passengers in Main Cabin Extra seats (not on Basic Economy tickets), AAdvantage members who accrue 15,000 Loyalty Points (milestone benefit), and select AAdvantage co-brand card holders. Group 6: General AAdvantage status holders.
The first involves your status within the Frontier Miles frequent traveler program. Elite 20K, 50K, and 100K members all get priority (also known as Zone 1) boarding. But it's not just elite members who get to board earlier; if you paid a carry-on bag fee, you may get access to Zone 1 boarding, too.