Ran across this a few years ago, a fantastic article about the SCA program.
https://www.thedrive.com/the-war-zone/25521/behold-arguably-the-most-spectacular-photo-of-nasas-shuttle-carrier-aircraft-ever
My wife and I also used Tacquan Air on our cruise ~2 yrs ago. Our time slot was overbooked so they brought in a Cessna 172 and a cargo pilot that had previously worked for one of the other excursion operators there doing Misty Fjords runs. Our pilot was in almost constant radio contact with the other pilots, announcing his altitude as we were approaching each pass and talking to every other aircraft when it came into visual contact to give relative position. It seemed standard operating procedure for them.
I hadn't flown in an Otter since I was a Civil Air patrol cadet in late 70s and my wife has never flown in one so it was a little disappointing we ended up in a 172 after I'd hyped upt he Otter. But everyone I met at Tacquan Air were really friendly and professional people. I hope their business can survive. It was my only float plane ride ever and was fantastic.