"Presidential Timetable 12/18/86". DC-9: Presidential Airways History, Fleet (B737 and BAe-146) and Memorabilia. Archived from the original on July 23, 2011. Retrieved July 4, 2010.
delta.com
"Flight Schedules"(PDF). Archived(PDF) from the original on April 14, 2018. Retrieved December 25, 2017.
departedflights.com
"74intro". Departed Flights. Archived from the original on January 26, 2011. Retrieved March 8, 2010.
"US70186". Departed Flights. Archived from the original on July 9, 2011. Retrieved July 4, 2010.
"PWM89intro". Departed Flights. Archived from the original on July 9, 2011. Retrieved July 4, 2010.
Don, Henchel (March 7, 2010). Larsson, Björn; Zekria, David (eds.). "Atlantic Airways". Airline Timetable Images. Archived from the original on June 12, 2011. Retrieved March 8, 2010.
Don, Henchel (March 7, 2010). Larsson, Björn; Zekria, David (eds.). "Aroostook Airways". Airline Timetable Images. Archived from the original on July 21, 2011. Retrieved March 8, 2010.
united.com
"Destination Map". Chicago: United Airlines Holdings. Archived from the original on June 23, 2022. Retrieved June 23, 2022.
"History". Portland International Jetport. Archived from the original on March 16, 2010. Retrieved March 8, 2010.
Don, Henchel (March 7, 2010). Larsson, Björn; Zekria, David (eds.). "Atlantic Airways". Airline Timetable Images. Archived from the original on June 12, 2011. Retrieved March 8, 2010.
Don, Henchel (March 7, 2010). Larsson, Björn; Zekria, David (eds.). "Aroostook Airways". Airline Timetable Images. Archived from the original on July 21, 2011. Retrieved March 8, 2010.
Sloan, Perry A. (August 14, 2006). "Air New England". AirTimes. Archived from the original on July 7, 2011. Retrieved March 8, 2010.
"US70186". Departed Flights. Archived from the original on July 9, 2011. Retrieved July 4, 2010.
"PWM89intro". Departed Flights. Archived from the original on July 9, 2011. Retrieved July 4, 2010.
"Presidential Timetable 12/18/86". DC-9: Presidential Airways History, Fleet (B737 and BAe-146) and Memorabilia. Archived from the original on July 23, 2011. Retrieved July 4, 2010.