U.S. Air Force Capt. Craig David Button is shown in Mesa, Ariz., in this 1991 handout photo. Button was the pilot of an A-10 Thunderbolt that disappeared Wednesday, April 2, 1997, while on a training flight in southwestern Arizona.

(AP Photo/HO)

1905: A gas explosion at the United Verde mine near Jerome kills five and injures seven.

1919: At 10 a.m., the first car to ever climb Tucson's Sentinel Peak, starts its trek upward. The car sustains one blown tire. The headlights are left on to prove the feat to residents, and the car is parked on the peak for two days so people could climb up and see it for themselves.

1933: Gov. Benjamin B. Moeur unveils a monument on the Arizona-New Mexico state line dedicating the Geronimo Trail from Douglas to Cloverdale, N.M.

1997: An A-10 Thunderbolt II piloted by U.S. Air Force Capt. Craig David Button disappears during a training mission in southwestern Arizona. In October 1997, The Air Force concludes Button, a pilot based at Davis-Monthan Air Force Base, probably made a sudden decision to fly to Colorado and commit suicide by crashing into a mountain.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.