As far as I remember those were Ace AI... although I found it strange that the 1 and 2 went off on a tangent. I never fly offline with anything other than Ace AI as there's no challenge.
As for online, the same type a/c management still applies as you have to keep 'cool'

.
One thing a lot of people get wrong with this game, is that you don't have to be at top speeds/revs 100% of the time to win a fight, you just have to have a better brain and flying capabilities. Once you get that right you'll never have an overheat, or very few of them, and will lose a lot less online DFs even when the odds are stacked against you.
Also flying on anything else other than a 100% server is a waste of time for the FW, as all the usable advantages are negated.