After a cursory look through, I think I agree with you about Newfoundland. The fact that there were documented witnesses who wrote about the sighting in the paper without actually knowing that there was a missing flight indicates to me that they're probably reliable. On the other hand, all the evidence about Maine seems like it was gathered far after the actual event and with many witnesses who had already heard about the flight. Plus... well, it isn't impossible for a small plane to crash in the woods in Maine without anybody finding anything, but it feels like 100 years and all the development that's happened since then would lead to SOMEBODY stumbling on it if it crashed on land.