City is the thematic title under which most Town-related System sets were released from 2005 and onward. There are numerous sets that are associated with Construction, Police, Fire, Emergency, Train, Airport, Transportation, Cargo, Traffic, Coast Guard, Farm, Great Vehicles, Mining, and Space. European catalogs featured another theme called City in the years 1999 to 2000, which was referred to as City Center in American catalogs.
The differences between the two jets mainly come on the top and rear of the builds. One has a larger single rear fin and two larger wings at the back, while the other has two smaller fins and the large wings positioned in the middle of the vehicle. The nose and cockpit areas are identical on both jets, and both come with stickers; the airshow logo on the wings, and a plane motif on the sides.
Anyway, I think this may be my favorite LEGO City air terminal yet! It may not be as big as some previous ones, but it feels really coherent. The plane is nice as well with its white, orange, and blue stripes. I agree that Heartlake City Airport's plane has a cozier and more detailed interior, though. It does really highlight some of the differences between Friends and City, with City opting for capacity over comfort and function over flair.