I actually really liked AHA on the ground and bought it at Safeway a few times. The only reason I didn’t buy it more is because I mostly shop at Whole Foods, which has aisles and aisles of La Croix. I drink AHA on UA flights most of the time, and I didn’t realize Coca Cola discontinued it in the consumer market.
I hope UA replaces it with another flavored sparkling water option. My vote would be for La Croix, but I’m guessing we’re limited to a Coca Cola product. Topo Chico would probably be a similar substitute, but I wonder if Topo Chico’s taller cans would be a problem in the galley carts.