To get back to the original question, I once saw a concept drawing of what may well be the sort of aircraft Canada needs given the vast territory to be patrolled. A product of Canadair Advanced Design, it was a Challenger with both a mini-AEW radar and missiles. If anyone thinks that a modified bizjet could not possibly fill the role, I once had a very interesting conversation with a Japanese ECM expert, who wanted a similar modified Challenger. His version carried both jammers & HARM missiles to carry out a defensive version of Wild Weasel! You would have to wonder if a similarly equipped jet on standing patrol would counter the current multiple incursions that are causing the JASDF so much concern.