Question: When did the Simpsons nineteenth season air?
Context: "Papa Don't Leech" is the sixteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on April 13, 2008.  It features the return of Lurleen Lumpkin (voiced by special guest star Beverly D'Angelo) from the third season episode "Colonel Homer", after an absence of sixteen years (though she appeared in a few quick cameos on such episodes as "Marge vs. the Monorail" and "Team Homer").  The Dixie Chicks also appear as themselves.  It was written by Reid Harrison and directed by Chris Clements. G vs E (later retitled Good vs. Evil) is an American fantasy-based television action series that had its first season air on USA Network during the summer and autumn of 1999.  For the second season the series switched to Sci-Fi Channel in early 2000.  The series stars Clayton Rohner, Richard Brooks and Marshall Bell. "The Simpsons"' nineteenth season originally aired on the Fox network between September 23, 2007 and May 18, 2008. "Little Orphan Millie" is the sixth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It first aired on the Fox network in the United States on November 11, 2007.  This episode represents a milestone in Simpsons' history as it sees Kirk and Luann remarry after initially divorcing eleven seasons earlier.  It was written by Mick Kelly, production assistant to Al Jean, and directed by Lance Kramer.  During its first broadcast, the episode garnered 10.57 million viewers. The 2017 Air Force Central F.C. season was Air Force Central's 12th consecutive season in the Thai League 2.  This season Air Force Central participate in the Thai League 2, FA Cup and League Cup The 2014 Colorado Rapids season was the club's nineteenth season of existence, and their nineteenth season in Major League Soccer, the top tier of the American and Canadian soccer pyramids. "All About Lisa" is the twentieth episode and season finale of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on May 18, 2008.  Lisa Simpson becomes Krusty the Clown's newest assistant and steals his spotlight.  She wins Entertainer of the Year at the Springfield Media awards, but is warned that with her sudden fame comes a new attitude towards others and herself.  Meanwhile, Homer and Bart bond over their newfound love of coin collecting.  The episode features narration by Sideshow Mel.  It was written by John Frink and directed by Steven Dean Moore.  Drew Carey guest voices as himself, appearing as a guest on Krusty's show. "Any Given Sundance" (a play on the title of the film "Any Given Sunday", but otherwise unrelated) is the eighteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on May 4, 2008.  It guest-starred Jim Jarmusch and John C. Reilly as themselves.  After Lisa enters a film about her family into the Sundance Film Festival, Homer, Marge, and Bart, and Maggie are appalled by the candid behind-the scenes look at their family.  Meanwhile, Principal Skinner and Superintendent Chalmers decide to enter the movie business. "Mona Leaves-a" is the nineteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on May 11, 2008.  The episode features the death of Homer's mother, Mona Simpson.  Homer is reunited with his mother, Mona, but is not willing to forgive her for all the times she left him as a child.  When she dies, a guilt-ridden Homer attempts to make it up to her by fulfilling her final wishes.  It was written by Joel H. Cohen and directed by Mike B. Anderson and Ralph Sosa.  Glenn Close makes her third appearance as Mona Simpson, and Lance Armstrong has a cameo as himself. "He Loves to Fly and He D'ohs", also known as "He Loves to Fly", is the season premiere of "The Simpsons"’ nineteenth season.  It was the first episode to air after the release of "The Simpsons Movie", having originally aired on the Fox network in the United States on September 23, 2007.  In the episode, Homer falls in love with private planes after taking a flight to Chicago with Mr. Burns.  He tries to find a job that involves flying in a corporate jet, and hires a life coach named Colby Kraus to assist him with his goal.
Answer: September 23, 2007