Thanks Theoria and a fool in paradise. Seems like it's worth retracing their steps.
There was heavy fighting in New Guinea and New Britain for years during WWII. Allied air forces were very active and the rugged mountains caught a lot of planes. The big Japanese base was Rabaul on New Britain. We decided to bypass it, but it was under near constant air bombardment to keep it neutralized. Aircraft were lost in the effort.
It's hard to see that Earhart would have had enough fuel to get close to Howland and then backtrack all the way to New Britain.
That said, I agree. Worth a look to see what's there. Even if it's an allied military plane, finding it might bring someone some closure.