The first radio call from PhD candidate Christopher Pugh on a Twin Otter plane alerted the research team led by Professor Thomas Jennewein from the Institute for Quantum Computing (IQC) on the ground in Smiths Falls, Ontario that the receiver on the aircraft was receiving photons from the source on the ground. It was the first, crucial sign that the demonstration was going to be a success. Read the research paper on the arXiv: https://arxiv.org/abs/1612.06396 Quantum Photonics Laboratory, Prof. Thomas Jennewein, http://research.iqc.uwaterloo.ca/qpl/