For the complementary same day change on AA as a Platinum Pro or Executive Platinum:

- Can you do this on Basic Economy fares?
- Website says you can start 24 hours before your flight. If you have a 6 am flight on Monday, I assume you can start looking Sunday at 6 am. Question is will all flights on Monday show up at 6 am the day before, or is only flights within 24 hours (so for example, Monday afternoon flights not show up right away)?
- Website say companions on same itinerary can change too. Any limit on number of companions?

Thanks in advance. There are some really cheap 6 am flights but hoping to swap to something later that doesn't require a 330 am wake up call.