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The day Mexico joined World War II (eluniversal.com.mx)
Mexico joined the allies during WWII as a result of the May 13, 1942 German U-boat sinking two Mexican oil tankers, off the coast of Florida, transporting crude oil to the United States. Thirteen of thirty-five crew members of the SS Potrero del Llano and eight members of SS Faja de Oro were killed.
Dec 12: The U.S. sent support with two squadrons of bombers bringing Mexico's aerial support at ten.
Dec 17: "A high ranking military official said that Mexico expected to get 160 military planes of four types...a supply of planes for the Mexican Army's rudimentary air force has long been under negotiation"
TimesMachine: December 18, 1941 - NYTimes.com
The Mexican constitution mandated that the president obtain permission from the Senate, which would require public support. A former army general, President Avila Camacho knew the army was unprepared, but he also believed that a tactical air unit could be readied quickly.
To sell the idea to the public, the president ordered the FAM to stage an airshow. Near Mexico City on March 5, 1944, more than 100,000 capitalinos watched as AT-6s and A-24Bs blasted a simulated enemy base with live ordnance. The show was a stunning success, and shortly thereafter the president declared that Mexico should fight and that the FAM would lead the nation in the conflict.
World War II: Mexican Air Force Helped Liberate the Philippines
"As a result, on May 28, 1942, the Chamber of Deputies unanimously approved the decree by which it was established that since May 22, 1942, the United Mexican States were in a state of war." May 28, 1942, Mexico declares a State of War. | Ministry of National Defense | | Government gob.mx (www.gob.mx)
It was the U.S. Ambassador to Mexico, George S. Messersmith, who sent the message to President Roosevelt encouraging an arrangement for the U.S. to train the 400 members of Escuadron 201 alongside American pilots. His letter unknowingly foretold a little-known historical fact "for the actual need or help which such air squadrons would be to us."
A unique arrangement was made for the "Aztec Eagles" by Army Maj. Gen. Robert W. Harper according to his memo
According to the US Air Force website: Mexican Air Force Aircrews > National Museum of the United States Air Force™ > Display (af.mil)
Detailed accounts of heroism by the Escuadron 201 members and MEAF are found here: World War II: Mexican Air Force Helped Liberate the Philippines
Statistics of Escuadron 201
"The outstanding work made my those men (Escuadron 201) demonstrated that good things can only be achieved with leadership, teamwork and sacrifice, fighting side-by-side and shoulder-to-shoulder," said Lt. Col. Jose Nunez, Mexico's Foreign Liaison Officer from the Air Force Security Assistance Center at Wright-Patterson Air Force Base, during the exhibit opening ceremony.
Further details
*"El Universal was born on October 1, 1916 at the initiative of the engineer Félix Fulgencio Palavicini, who was part of the Constituent Congress of Querétaro....At the corner of Madero and Motolinía, in the center of the capital, the first newsroom and the workshops of the newspaper were located, equipped with a Goss press. On this machine was printed the first Political Constitution of the United Mexican States in 1917."