Hey, been lurking for a while and finally felt I had enough to offer back.
Here's an update on the JFK lot based on my 20 rentals this year so far:
Roughly a 20 car aisle for Executive; around 25 for Emerald.
I've had my fair share of luck on the executive aisle

2016 Mustang GT convertible
2016 Dodge Charger R/T
2016 Chrysler 300c HEMI
2016 Nissan Altima 3.5 SL
etc.
Expect to see GMC, Chevy, Nissan, Jeep
Don't expect to see Ford, Hyundai, Kia, Buick
Premiums are usually Cadillac; CTS and XTS
There's always a good number of SUVs and minivans off the aisle too.