I still wish we had solid proof that he was in Boulder...
Do airlines keep records of passenger lists back 10 years?
I think there are really 4 key things to this case now:
1.) Is there any kind of DNA match to the scene?
2.) Was JMK in boulder that night?
3.) Was Burke Ramsey's voice really on the 911 tape?
4.) Is any information about the crime scene that JMK has truly privileged?
I think a definitive answer on any one of those would move the investigation much close to the culprit.