- vancouver
- montreal
- ottawa
- toronto

of those airports >

which customs preclearance would be servicing the fewest flights per day?

anyone know about VIP offerings?

Not sure about the nature of your question.

My experience would suggest Ottawa, but YOW also has fewer transborder CBP officers, so if your question is about wait times it's probably moot.

Also, 'number of aircraft' is a bit of a red-herring - There will be considerably more bodies in five 757s than there will be in five Dash-8s - The same number of aircraft, but way more pax.

As to VIP service, it varies by airport. In Vancouver, you go through security first, then talk to CBP. If you have nexus they in theory move you to a faster security line, but I don't seem much speed as they also put Kettles with kids and wheelchairs in that line.

In Toronto, you go through CBP first, then security. Nexus will get you thorugh CBP faster, and then if you're an elite you can go through a faster security line.

good point, should have said fewest passengers. is this kind of broken down data easily accessible online?

by VIP i mean paid VIP offerings, either skip all lines or private handling.

Private planes get private handling.

private air = private airport > private airport

going back to flights vs passengers, i think i did go through that thought process, but was just thinking that number of flights is a readily available figure

If you pay for a NEXUS card you can move to the front of the line at US CBP transborder areas. Those who haven't paid for the car queue up.

If you pay for a first-class ticket on Air Canada, you can use the "fastrak" queues at security which, in theory, move you to the front of the security line (although this tends to be hit and miss).

So, for example, at Toronto Pearson if you have NEXUS and a first-class Air Canada ticket you will move to the front of the line at the CBP checkpoint, then after CBP you will move to the front of the line at security.

Then of course, as you say, you can also fly privately.

only interested in finding out what paid (escort through customs) offerings there are

Sorry, can't help you there. I assume they exist as I presume, for example, that movie stars that are flying commercial don't queue up with the rest of us.

Best reach out to CBP.

If you are referring to something akin to BKK Premium Flight Services, I don't think such a thing exists, not at YVR anyway. It would be very un-Canadian to have such a service
If the airline you are flying with deems you to be a VIP, then they will arrange for an escort through INS, Customs, security etc.
Speaking from YVR experience only, the wait times for INS have never been more than 10 to 15 minutes. As GGlave pointed out, the priority line for security is laden with people who slow the system down. The only thing I can imagine an escorted trip through all this would do, is take you through INS a little faster and maybe push you ahead of the wheelchairs and strollers at security.
You may save 10 minutes overall.
YVR transborder is usually very effecient, at least has been for me on all the times I have been through there.

In Terminal 1 (Air Canada's terminal) the Pearson Priority Lane offers queue bypassing for security screening. Get into it with Air Canada Premium Cabin boarding pass, The Platinum Card from American Express, Aeroplan Plus Platinum Card from AMEX.

vancouver - last US departure (CX to JFK) is 2:20 after previous departure

also (possibly) >

calgary > DFW/ORD on AA, with AA Five Star Service on arrival

CBP is done at most large Canadian airports prior to departure to US so flying to DFW or ORD from YYC that would not help.

yup - forgot about the other 4 airports (incl calgary) as the 4 i listed in OP were for WAS