Global Business Travel Association (GBTA)
https://www.gbta.org/

American Society of Travel Advisors
http://www.asta.org/

National Business Aircraft Association
http://www.nbaa.org/

Wyvern
http://www.wyvernltd.com/

Aviation Research Group US (ARGUS)
http://www.aviationresearch.com/

Weather.com
http://www.weather.com/

Gocurrency.com
http://www.gocurrency.com/