You would be able to buy food and take it on the plane. However, any liquids in carry on would be restricted to the 100 ml individual amounts and all of said containers fitting into the l litre plastic bag. So if you are going to buy a soft drink, get it after clearing security when you are at the gate. IMO, there will be no argument when you buy food and drink from the kiosks that are post security around the gate.
You will be restricted though when entering Canada. All plant, animal and food items must be declared for Canada Customs at Vancouver. They usually take apples and fresh fruit, but not trail mix, granola bars, muffins, bagels, cookies, anything cooked.
The first paragraph for 3-1-1 for carry ons will give you the idea:
If your flights were purchased on one ticket (through a single airline, even if one leg is a codeshare with another airline) then your bags will most likely be checked all the way through to your final destination. If you bought two separate tickets, you may have to reclaim and recheck your bags. You should either call your first airline in advance to ask, or ask at the bag check counter.
If you will fly from Vancouver back to CLT then one thing to keep in mind is that the airport offers US border formalities there - you will go through US immigration at YVR and fly to the States as a domestic passenger.
Depending on the time of day of that flight from YVR you will need to allow from 30 to 45 minutes for the process, something to keep in mind when planning when to arrive at the airport on departure day.
Bus loads of passengers from the cruise lines show up at the airport. US customs for us was easier at YVR than any other customs or immigration but you cannot speed up the process, if you are at the end of the line.
When I fly to the US I am at the correct end of the International Terminal, checking in, 90 min ahead of my flight for any time other than a 6 am flight. US Customs don't open until 5 am at YVR so an hour does it there. Security is the shoes off kind. The Customs conversation for me is pretty easy but whatever the line up is takes whatever time it takes.
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