Plenty of theories about the disappearance of Malaysian Airlines Flight 370 have been making the rounds, but one new theory is generating a lot of chatter today.

Keith Ledgerwood, who calls himself a hobby pilot and aviation enthusiast, wonders if Flight 370 possibly shadowed a Singapore Airlines 777, following closely enough to appear as a single blip on the radar.

It is my belief that MH370 likely flew in the shadow of SIA68 [a Singapore Airlines jet en route from Singapore to Spain] through India and Afghanistan airspace.  As MH370 was flying “dark” without transponder / ADS-B output, SIA68 would have had no knowledge that MH370 was anywhere around and as it entered Indian airspace, it would have shown up as one single blip on the radar with only the transponder information of SIA68 lighting up ATC and military radar screens.

Ledgerwood’s post includes much more detail supporting his theory, but he also answered specific questions through Twitter.