On Friday, July 31, 2015 at 7:07:45 PM UTC-7, Bill T wrote:

And if he's close enough for the airliner to be an issue, he's within the hockey puck airspace to piggyback on the TIS-B data being broadcast to the airliner. So the airliner sees the glider 1202 code.

BillT

An airliner likely has TCAS and will interrogate the glider's transponder directly.

*If* the Airliner has TIS-B capable equipment then it will receive position reports for nearby transponder equipped aircraft that are in SSR coverage.... the target aircraft do not need to be in any hockey puck". it works the other way... its TIS-B or ADS-R receiving aircraft that need to be within a "hockey puck" to see other threats... hockey pucks created by their own ADS-B Out devices.