Predicting the trajectory of a cannonball is applied mathematics. Aircract autopilot and cruise control are only slightly more elaborate. You can't label every algorithmic control system as "AI".
And every AI product in existence is the same. Map navigation, search engine ranking, even register allocation and query planning.
Thus they are not AI, they're algorithms.
The frontier is constantly moving.
So you’re right that some of these things aren’t AI now. But they were called that at the start of development.
> All sciences are just highly abstracted physics
Certain adaptive cruise control systems certainly are considered AI (e.g. ones that utilize cameras for emergency braking or lane-keep assist).
The line can be fuzzy — for instance, are solvers of optimization problems in operations research "AI"? If you told people in the 1930s that computers would be used in a decade by shipping companies to optimally schedule and route packages or by militaries to organize wartime logistics at a massive scale, many would certainly have considered that some form of intelligence.
Where is the line where they stop being algorithms?