https://www.aopa.org/news-and-media/all-news/2012/november/09/nov-09-2012-issue-of-aopa-epilot-flight-training-edition-weekly-newsletter
Nov. 09, 2012, issue of 'AOPA ePilot: Flight Training Edition' weekly newsletter - AOPA
ePilot Training Tip: 'Positive rate'
nov 09 2012