What about the contact a flight from Kuala Lumpur to Narita 30min ahead of MH370 made on 121,5 after it disappeared and failed to check in with Vietnamese ATC - they heard mumbling and static from MH370.
Guess this contact is recored by (several) ground stations.
Here you could (maybe) hear if there are any signs of hypoxia, state of AC (background noise etc).
Find it strange this have barely been mentioned at all...
Or is this contact also a hoax?
Also, they ought to check/know if "Allright, goodnight" was common practice by these pilots, or the pilot on the R/T doing that last conversation.
If they usually were by-the-book pilots regarding R/T, its a bit strange with this R/T - again: first signs of hypoxia?