There are various APIs online for accessing TLEs for a satellite object from CelesTrak. However, the APIs retrieved are usually the most recent ones generated.
There are also a lesser number of APIs for accessing stored TLE data for old historical satellites, such as those operated by NASA, ESA or Roscosmos.
Are there any APIs out there that provide access old (as old as possible) TLEs for non-historical satellites? I think Space-Track has some data, but I believe the only way to access that data is manually via the UI on the website?