Captain Marvel coming to Superman's aid definitely counts, particularly once you consider that their last - and arguably most famous - major encounter was in Kingdom Come, where the two fought one another. The scene is even a mirror of the Kingdom Come moment, but instead of the Captain standing over Superman, ready to fight, he extends his hand to a man who could really use it.
Jean Loring sat next to a fatally wounded Ray Palmer. She initially wanted her to quit being a superhero, but more than ever she wants him to come back to her. Much more heartwarming, despite what happens between them.
The Phantom Stranger snaps Hal Jordan out of a hallucination, then actually hands him his power battery so that he can recharge and fly back to Earth.