Eldred v. Ashcroft, 01 U.S. 618, p. 67 (Supreme Court January 15, 2003) ("Even the $500,000 that United Airlines has had to pay for the right to play George Gershwin's 1924 classic Rhapsody in Blue represents a cost of doing business, potentially reflected in the ticket prices of those who fly."), archived from the original.
"Airline Certificate Information – Detail View". av-info.faa.gov. Federal Aviation Administration. August 11, 1938. Archived from the original on September 4, 2015. Retrieved January 11, 2015. Certificate Number CALA014A
"Airline Certificate Information – Detail View". av-info.faa.gov. Federal Aviation Administration. August 11, 1938. Archived from the original on September 4, 2015. Retrieved January 11, 2015. Certificate Number CALA014A
Eldred v. Ashcroft, 01 U.S. 618, p. 67 (Supreme Court January 15, 2003) ("Even the $500,000 that United Airlines has had to pay for the right to play George Gershwin's 1924 classic Rhapsody in Blue represents a cost of doing business, potentially reflected in the ticket prices of those who fly."), archived from the original.