The failed Sopwith Atlantic flight, 1919

The transcript discusses the first successful flight by Americans using a C4 flying boat via the Azores. It then highlights the attempt by Orca and Mackenzie Grieve to complete a nonstop flight, which ultimately failed due to bad luck rather than technical issues.

What geographical feature did the Americans use as stepping stones for their flight?

What was the outcome of the flight attempt made by Orca and Mackenzie Grieve?