Since Time and Tide, DC has undergone additional continuity resets, such as Infinite Crisis and Flashpoint ... as it gives Aquaman a layer many of his Justice League teammates lack.
Aquaman's first superhero meeting was with Superman and Green Arrow, followed by the Justice League in The Brave and the Bold #28. Aquaman called the first Justice League meeting in the comics ...
Next to that, there's the armor for Aquaman (with the tell-tale A on the belt), but even more interesting is the artwork for what looks to be his wife Mera's costume. "Justice League: Part One ...