https:// www.usnews.com/news/best-states/indiana/articles/2018-04-17/report-pilot-didnt-see-other-plane-before-indiana-crash

https:// www.delawareonline.com/story/news/2018/04/17/united-airlines-plane-makes-emergency-landing-dover-airforce-base/523583002/

http:// wgntv.com/2018/04/17/southwest-flight-makes-emergency-landing-in-philadelphia/

http:// www.wboc.com/story/37976500/del-guardsmen-taken-to-hospital-after-plane-leaks-fumes