Sometimes, Amazon gives ample notice that a movie is expiring so you can plan accordingly. But other times, movies are removed from the streaming service due to licensing issuesd without any forewarning.

Prime Video conducts regular reviews using customer signals and viewing behavior (like completion rate, unique customer streams, and total hours) to determine which titles are resonating with customers. Content that underperforms or fails to meet our engagement standards may be subject to removal from the service.

For aircraft speeds which are much greater than the speed of sound, the aircraft is said to be hypersonic. Typical speeds for hypersonic aircraft are greater than 3000 mph and Mach number M greater than five, M > 5. We are going to define a high hypersonic regime at M > 10 to account for re-entry aerodynamics.

Supersonic means faster than the speed of sound, while hypersonic means specifically five times faster than the speed of sound. Therefore, all hypersonic speeds are also supersonic, but something supersonic is not necessarily hypersonic.