A focus on the fuel switches in a preliminary assessment raised questions about the pilots’ actions, but much is still unknown about Flight 171.

The Air India airliner carrying 230 passengers and 12 crew members was on its way to the United Kingdom when it crashed into a building shortly after takeoff on June 12, killing all aboard, except for one survivor, and several people on the ground, according to authorities.

At least 15 people were hospitalized after a skydiving plane crashed near a New Jersey airport; an investigation is ongoing.