In Action Comics #864, which acts as an epilogue to Superman and the Legion of Super-Heroes, Lightning Lad escorts Superman back to the 21st Century, and Batman walks in on the two reminiscing on old times. Batman and Garth are uneasy towards one another right away, Batman due to his mistrust of time travelers, and Garth because of Batman's jerk ass attitude. By the end of it, as Garth is ready to depart back to the future with the bodies of Karate Kid and one of Triplicate Girl's duplicates, he apologizes to Batman for having got on his case. Garth then thanks Superman for the time they spent talking about old times, ad that he was more of a brother to him than Mekt ever was.
From the same issue, Superman telling Batman that, in the future, the two are known as "the World's Finest". He's lying, but it's sweet nonetheless.
The end of the first issue of Mark Waid's "Threeboot" series, when Invisible Kid asks Star Boy why they don't let the group of young Legion supporters camped outside their headquarters inside.
Star Boy: Let them? Do you not remember like, six months ago? Aaah, I probably shouldn't be shocked that there was no newslink to it on the Infogrid, it made us look too good. The Science Police had reached the end of their extremely exhaustible patience with us. The were past the point of caring who had a right to be where. They just wanted the Legion gone. So we wok up one morning to the sound of grav-impact bulldozers heading for this building. I'm talking about machines that could level a moon. There was no way even we could have taken them down in a fight. But we didn't have to. Those guys downthere stood up—I mean to a one, they stood up—and they marched forward and they formed a human shield around the whole plaza. It was the second-most amazing thing you can imagine.
Invisible Kid: What's first?
Star Boy: That they'd do it again if it came to it. They're free to come inside whenever they like. They choose not to. There are a lot of cool things about being with the legion, my friend, but never forget the coolest...they're not here because of us...we'ere here because of them.