The employees of Six Flags denied the customers access to the ride, but they can still go on other rides.

Who is "they" in this prior sentence?
the customers
Chevrolet had to recently recall their cars so they could receive a repair in their brakes.

Who is "they" in this prior sentence?
their cars
Seth is smarter than Sai, and consequently he got a better job.

Who is "he" in this prior sentence?
Seth