Question: Former Brigadier General William Thomas Seawell headed what major airline until its collapse in 1991?

Context articles: Henry Goddard Thomas
Pan American World Airways
Wilmot Gibbes de Saussure
Rodney L. Johnson
Hla Myint (Brigadier General)
William Denman Croft
Lee's Mill Earthworks
Coral Wong Pietsch
William Seawell
Meridian Expedition

Brigadier General and Brevet Major General Henry Goddard Thomas (April 5, 1837 – January 23, 1897) was a Union general in the American Civil War.
 A native of Portland, Maine, Thomas graduated from Amherst College in 1858 and was admitted to the bar shortly thereafter.
 He enlisted as a private in the 5th Maine Volunteer Infantry Regiment.
 Promoted to captain in June 1861, Thomas was present at the First Battle of Bull Run and the Peninsula Campaign among other battles.
 In February 1863, Thomas was appointed colonel of the 2nd United States Colored Infantry.
 In December 1863, Thomas was appointed colonel of the 19th United States Colored Infantry.
 On November 30, 1864, President Abraham Lincoln appointed Thomas a brigadier general of volunteers to rank from his appointment date.
 The President nominated Thomas for the appointment on December 12, 1864 and the U.S. Senate confirmed the promotion on February 23, 1865.
 Thomas was mustered out of the volunteers on January 15, 1866.
 On March 29, 1867, President Andrew Johnson nominated Thomas for appointment to the grade of brevet major general of volunteers for his service during the war, to rank from March 13, 1865, and the U.S. Senate confirmed the award on April 5, 1867.
 Henry Goddard Thomas died in January 23, 1897 in Oklahoma City Indian Territory (Oklahoma) and is interred at Evergreen Cemetery in Portland, Maine.
Pan American World Airways, known from its founding until 1950 as Pan American Airways and commonly known as Pan Am, was the principal and largest international air carrier in the United States from 1927 until its collapse on December 4, 1991.
 Founded in 1927 as a scheduled air mail and passenger service operating between Key West, Florida, and Havana, Cuba, the airline became a major company credited with many innovations that shaped the international airline industry, including the widespread use of jet aircraft, jumbo jets, and computerized reservation systems.
 It was also a founding member of the International Air Transport Association (IATA), the global airline industry association.
 Identified by its blue globe logo ("The Blue Meatball"), the use of the word "Clipper" in aircraft names and call signs, and the white pilot uniform caps, the airline was a cultural icon of the 20th century.
 In an era dominated by flag carriers that were wholly or majority government-owned, it was also the unofficial overseas flag carrier of the United States.
 During most of the jet era, Pan Am's flagship terminal was the Worldport located at John F. Kennedy International Airport in New York City.
Wilmot Gibbes de Saussure (July 23, 1822  – February 1, 1886) was a brigadier general in the South Carolina militia, who served along with the Confederate States Army in South Carolina at various times during the American Civil War.
 As a colonel, he led his regiment in the occupation of Fort Moultrie and the bombardment of Fort Sumter at the beginning of the war.
 He was appointed brigadier general as well as adjutant general and inspector general of South Carolina militia in 1862.
 He commanded part of the Charleston defenses during the Union siege of the city in 1863.
 He also led his men in opposition to Major General William T. Sherman's march through the Carolinas.
Brigadier General Rodney L. Johnson (born 13 April 1955) is a former brigadier general of the United States Army.
Hla Myint (Burmese: လှမြင့် ] ) is a Burmese politician, and mayor of Yangon.
 He was also a former brigadier general in the Myanmar Army and a former diplomat.
 He studied at the Defense Services Academy from 1967 to 1971.
 He retired as brigadier general in 2002.
 After military service, he was appointed ambassador to Argentina and Brazil from 2002 to 2005, and ambassador to Japan from 2005 to 2010.
Brigadier General William Denman Croft, {'1': ", '2': ", '3': ", '4': "} (15 March 1879 – 14 July 1968) was a British Army officer.
 He served as a brigadier general in the British Army in the First World War, and afterwards in India.
 He was one of seven British officers to be awarded the Distinguished Service Order four times in the First World War.
 He was Home Guard commander in Cornwall during the Second World War.
Lee's Mill Earthworks is a historic archaeological site located at Newport News, Virginia.
 The earthworks formed part of the fortifications along the James River, which included fortifications at Fort Crafford, as well as, Dam No.1, and Wynne's Mill in Newport News Park.
 On April 5, 1862, advance units of Union Brigadier General Erasmus D. Keyes' IV Corps, under the command of Union Brigadier General William Farrar Smith, encountered Confederate units commanded by Brigadier General Lafayette McLaws at Lee's Mill.
 Heavy rains and massive earthen fortifications defending the river crossing stopped the Union troops from proceeding to Richmond.
 Confederate Major General John B. Magruder's extensive defensives beginning at Lee's Mill and extending to Yorktown along the Warwick River caused the Union Army of the Potomac Commander Major General George B. McClellan to initiate a month-long siege of the Warwick-Yorktown Line which lasted until May 3, 1862 and contributed to the eventual failure of McClellan's campaign.
Coral Wong Pietsch is a United States Judge for the United States Court of Appeals for Veterans Claims.
 She is a former Brigadier General in the United States Army Reserve.
 She was also the first Asian American woman to reach the rank of Brigadier General in the United States Army.
William Thomas Seawell (January 27, 1918 – May 20, 2005) was a Brigadier General in the United States Air Force and former head of Pan Am.
The Meridian Expedition took place from February 3 to March 6, 1864 under the command of Major General William Tecumseh Sherman, in command of the Department of the Tennessee.
 The columns were under the command of Brigadier General William Sooy Smith and Colonel James H. Coates.
 The expedition was tasked to destroy a rebel cavalry commanded by Major General Nathan Bedford Forrest, maintain communications with Middle Tennessee and take men from the defense on the Mississippi River to the Atlanta Campaign.
 To maintain communications, they were to protect the Mobile and Ohio Railroad.
 The expedition ended with the Union Army abandoning Yazoo City.