An attorney for the families says the cruise line was required to inform passengers that floatplane tours could be hazardous.
Investigators have not yet pointed to a cause for the crash.
Pilots described cloud ceilings as low as 600 feet above the ground in the valley where the aircraft was found.
Investigators flew over the site on Sunday, but poor weather and low visibility hampered efforts to land until Wednesday, when the weather began to clear.
A KUCB and ProPublica investigation in June found that Alaska is home to a growing share of the country’s crashes involving small commercial aircraft. Over the past two decades, the number of deaths in crashes involving these operators has plummeted nationwide, while in Alaska deaths have held relatively steady.
Responders reached the crash site and recovered the bodies on Saturday afternoon.
The NTSB says the plane flipped on takeoff after hitting a buoy.