Apparently they were supposed to be phased out by 2018 but it's been delayed: https://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=14754 https://www.faa.g

Apparently they were supposed to be phased out by 2018 but it's been delayed: https://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=14754 https://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=1...