I have not read that article, a link anyone?
Were the aircraft in radio contact prior to 15 miles?
Did they get a RA or even a TA?
If they were going head to head they would have 1 to 2 min before impact so TA not really an option? check my maths on that one.
IF they were in contact, and they were aware of eachother then what is the conern? Where does this 15nm figure come from?
TIBA is a joke, however any examples used to further the cause need to be rock solid, this one appears not to be. More concerning the AsA and CASA's revelation that this is an "international practice". Lets say that the Lear was crewed by US pilots, how the hell would these guys know about TIBA? Sure its in the AsA published AIP, but why on earth would a US pilot have that? What about Jepps, well in the ATC "AU" pages its there, but once again the US pilots would not have those they would have the "AUSTRALIA" ATC pages which is a condensed version (and last time I looked no TIBA in there). Perhaps to address this there is now a YSHO notam listing TIBA, 10 out of 10 for tin plating but I'm not sure it will achieve much.