In a surprise twist, when they explore it in detail, it turns out to be MH 370.
II - If they have even the vaguest sense of scale from their image - MH370 was a https://en.wikipedia.org/wiki/Boeing_777-200ER. Vs. Earhart was flying a https://en.wikipedia.org/wiki/Lockheed_10E. There is a ~10X difference in wing area, and ~50X difference in weight.