Charter flight operators need to follow the same safety measures that major passenger airlines comply with, according to the National Transportation Safety Board (NTSB), which is in the process of investigating a string of recent accidents involving for-hire aircraft.
The latest incident occurred May 13, 2019, when a mid-air collision between two floatplanes near Ketchikan, Alaska killed five people and injured ten others. Both aircraft were conducting “flightseeing” tours that allowed passengers aerial views of scenic attractions.

Full article: Recent tragedies put safety of “flightseeing” planes under scrutiny
Source: Safety Best Practices