The dives on the 3-tank and Adventure charters are usually live boat dives, and often on the Wednesday Adventure charter you'll get a 3rd dive by going to a smaller site for your 2nd tank, cutting it short (since you're done exploring anyway), and using the rest of your tank at another shallow/smaller site. Like doing Three Anchors, coming up with 1500psi and doing Hellcat afterward. Both sites are easily explored in 20-30 minutes and not too deep. Or doing Third Tank and Red Hill each for 1/2 tank of air.
So the Wed Adventure charter is sometimes a 3-dive trip, but not a 3-tank trip?