Question: What was the name of the sister company of Lynx Aviation that operated out of Denver, Colorado?
Context: The Colorado Eagle was an American streamlined passenger train operated by the Missouri Pacific Railroad (MP) in the mid 20th century.  It operated between St. Louis, Missouri and Denver, Colorado, using MP trackage from St. Louis to Pueblo, Colorado and traveling on the Denver & Rio Grande Western Railroad from there to Denver.  The train began service on June 21, 1942 and operated until March 1964, when the name as well as on-board amenities were dropped as the MP reduced passenger service across its system.  On April 2, 1966, the MP canceled the remaining unnamed trains servicing Denver, ending passenger service along the "Colorado Eagle"<nowiki>'</nowiki>s route west of Kansas City. The Colorado Aviation Hall of Fame was established by the Colorado Aviation Historical Society (CAHS) in Denver, Colorado, USA, on November 11, 1969 for the State of Colorado.  The original and first ten Colorado aviation pioneers were inducted into the Hall on that date.  Guest speaker for the event was author Ernest K Gann.  The Hall of Fame is part of the Society's "Heritage Hall" in the Wings Over the Rockies Air and Space Museum, Denver, Colorado. Lynx Software Technologies, Inc. (formerly LynuxWorks) is a San Jose, California software company founded in 1988.  Lynx Software Technologies specializes in secure virtualization and open and reliable real-time operating system (RTOS).  Originally known as Lynx Real-Time Systems, the company changed its name to LynuxWorks in 2000 after acquiring, and merging with, ISDCorp (Integrated Software & Devices Corporation) a nine-year-old embedded systems company with a strong Linux background.  In May 2014, the company changed its name to Lynx Software Technologies as a representation of the company’s forward direction as the LynxOS RTOS family of products and the LynxSecure hypervisor continued to gain increased traction both with current customers and markets, and with the new Internet connected embedded world. The Denver Dry Goods Company, also known as "The Denver", was established in Denver, Colorado in 1879 by Michael.  J. McNamara and L.H. Flanders as M.J. McNamara & Company and later The McNamara Dry Goods Company.  The beginnings of the company can be traced back to 1876 when they had both worked as clerks at another dry goods store in Denver.  In 1877, McNamara left that store and formed a partnership with Edgar H. Drew.  After two years, Drew left and L. H. Flanders came on as co-owner.  In 1893, McNamara turned the store's ownership over to Dennis Sheedy and Charles Kountz and in 1894, the company was reorganized under the name, "Denver Dry Goods Company".  For a while it was claimed to be the largest department store west of Chicago.  A description on one postcard from 1916 read: "The Largest Store in the Central West, 400 Feet long-Seven Acres Floor Area, 1,200 Employees, A $1,500,000 Stock, 15th to 16th on California Street Denver Colorado". The Colorado Aviation Historical Society (CAHS) is located in Denver, Colorado and was founded in 1966.  CAHS home is at Wings Over the Rockies Air and Space Museum.  The Society acquires, restores, preserves and provides for public display, aircraft and other objects, documents, items and things of present or historical interest or value in connection with the development and history of aviation in the State of Colorado.  CAHS host many aviation events and participates in many of Colorado's air shows and fly-ins.  The Society has regular membership meetings and publishes a quarterly history journal.  The Society owns an Alexander Eaglerock Model 24 Long Wings which is on loan and display at the Pueblo Weisbrod Aircraft Museum, Pueblo, Colorado. Auraria Library is an academic library located in downtown Denver, Colorado.  It provides academic resources and research experiences to students, staff, and faculty at the University of Colorado Denver (CU Denver), the Metropolitan State University of Denver (MSU Denver), and the Community College of Denver (CCD) on the Auraria Higher Education Center (AHEC) campus, also called the Auraria Campus.  The Library is administratively operated by CU Denver and occupies a building owned by the State of Colorado. The Denver, South Park, and Pacific Railroad (later called the Denver, Leadville and Gunnison Railway) was a historic narrow gauge railroad that operated in Colorado in the western United States in the late 19th century.  The railroad opened up the first rail routes to a large section of the central Colorado mining district in the decades of the mineral boom.  The railroad took its name from the fact that its main line from Denver ascended the Platte Canyon and traversed South Park.  Founded in 1872 by Colorado Governor John Evans, the company was purchased by the Union Pacific Railway in 1880, though it continued to be operated independently.  The line went bankrupt in 1889 and was reorganized under the new moniker the Denver, Leadville and Gunnison Railway.  When the Union Pacific went bankrupt in 1893, the DL&G lines went into receivership and were eventually sold to the Colorado and Southern Railway.  In the first half of the 20th century, nearly all the company's original lines were dismantled or converted into .  The last train to run the old DSP&P tracks was from Como, Colorado on April 11, 1937.  A section of the standard gauge line between Leadville and Climax is still operated as a passenger excursion railroad called the Leadville, Colorado and Southern Railroad.  At its peak the Denver, South Park and Pacific Railroad had 335 mi of narrow gauge line, making it the largest narrow gauge railroad in the state of Colorado. Lynx Aviation, Inc. was a regional airline based in Denver, Colorado, United States.  The airline began as a sister company to, and operated feeder service for, Frontier Airlines.  The Lynx name plays off of the tail pictures of its planes, specifically Larry the Lynx, and the fact that it "links" smaller airports to the main Denver hub of Frontier Airlines.  All flights operated by Lynx Aviation were sold and marketed as "Frontier Airlines operated by Lynx Aviation." Frontier Airlines is an American ultra low cost carrier headquartered in Denver, Colorado.  The carrier, which is a subsidiary and operating brand of Indigo Partners, LLC, operates flights to 54 destinations throughout the United States and 5 international destinations.  The airline maintains a hub at Denver International Airport with numerous focus cities across the United States.  Also, under a codeshare agreement with Great Lakes Airlines, the airline connects passengers to surrounding Rocky Mountain States through their Denver hub. Helen Gilmer Bonfils (November 16, 1889 – June 6, 1972) was an American heiress, actress, theatrical producer, newspaper executive, and philanthropist.  She acted in local theatre in Denver, Colorado, and on Broadway, and also co-produced plays in Denver, New York City, and London.  She succeeded her father, Frederick Gilmer Bonfils, as manager of "The Denver Post" in 1933, and eventually became president of the company.  Lacking heirs, she invested her fortune into providing for the city of Denver and the state of Colorado, supporting the Belle Bonfils Blood Bank, the Bonfils Memorial Theatre, the University of Denver, the Denver Zoo, the Dumb Friends League, churches, and synagogues.  Her estate endowed the Denver Center for the Performing Arts.  She was posthumously inducted into the Colorado Women's Hall of Fame in 1985 and the Colorado Performing Arts Hall of Fame in 1999.
Answer: Frontier Airlines