Question: Jack Del Rio was a lineback for how many NFL teams

Context articles: Caja del Rio
Del Rio International Airport
2017 Oakland Raiders season
Mike Del Rio
Paula Losoya Taylor
Del Rio, Texas
Jack Del Rio
2011 Jacksonville Jaguars season
Mini Psicosis
Santa María del Río, San Luis Potosí

Caja del Rio (Spanish: "box of the river") is a dissected plateau, of volcanic origin, which covers approximately 84,000 acres of land in northern Santa Fe County, New Mexico, United States.
 The region is also known as the Caja, Caja del Rio Plateau, and Cerros del Rio.
 The center of the area is approximately 15 miles (23 km) west of Santa Fe, New Mexico.
 Most of the Caja is owned by the United States Forest Service and managed by the Santa Fe National Forest.
 Access is through New Mexico Highway 599, Santa Fe County Road 62, and Forest Service Road 24.
Del Rio International Airport (IATA: DRT, ICAO: KDRT, FAA LID: DRT) is two miles northwest of Del Rio, in Val Verde County, Texas.
 It is used for general aviation, and being near Laughlin Air Force Base it is often used by USAF students.
 On June 7, 2012 United Express operated by ExpressJet introduced jets nonstop to Houston, previously flown with turboprops.
 United Express ended service to Del Rio in April 2013.
But currently has non-stop service to Dallas/Fort Worth Airport with Texas Sky Airlines.
The 2017 Oakland Raiders season is the 58th overall season of the Oakland Raiders franchise, the franchise's 48th season in the National Football League, their 24th season since their return to Oakland, and the third under head coach Jack Del Rio.
 The Raiders are looking to win their first AFC West title since 2002 and the Super Bowl for the first time since 1983, when the club was still in Los Angeles.
 The Raiders began the season on September 10 at the Tennessee Titans and will finish the season December 31 at the Los Angeles Chargers.
 The Raiders, as they did in 2016, will play one home game in Mexico City, this time against the New England Patriots.
Michael Francis Gonzalez (born March 8, 1988), also known by his stage name Mike Del Rio, is a musical artist, producer, and songwriter from New York, NY now based in Los Angeles, CA.
 He is the co creator and lead member of the alternative group POWERS along with songwriter, vocalist and instrumentalist Crista Ru signed to Republic Records.
 As a record producer, Del Rio's eclectic style and musicality has led him to work with an array of artist such as Kylie Minogue, Selena Gomez, Eminem, Christina Aguilera, Cee Lo Green, Cheryl Cole, The Knocks, Skylar Grey, Jamie N Commons, and X Ambassadors.
 Most recently Del Rio executive produced recording artist LP latest album "Lost on You" containing the global hit title track "Lost on You".
 He is signed to Alex Da Kid's publishing company KidinaKorner distributed through Universal Music Group.
Paula Losoya Taylor (also Paula Losoya de Rivers, ?
 - July 17, 1902) was one of the founders of San Felipe Del Rio (later, Del Rio) in Texas.
 Her hacienda in Del Rio became a major employer in the region and also an important gathering spot for worship, discussion and more.
 Taylor donated land to create a Catholic cemetery, a fort and schools in Del Rio.
Del Rio is a city in and the county seat of Val Verde County, Texas.
 It is 152 miles west of San Antonio.
 As of 2015, the city had a population of 40,549.
 Del Rio is connected with Ciudad Acuña via the Lake Amistad Dam International Crossing and Del Río – Ciudad Acuña International Bridge.
 Del Rio is also home to Laughlin Air Force Base, the busiest United States Air Force pilot training complex in the world.
Jack Louis Del Rio Jr. (born April 4, 1963) is head coach of the Oakland Raiders of the National Football League (NFL).
 A linebacker for four NFL teams between 1985–1996, he played both football and baseball for the University of Southern California Trojans.
The Jacksonville Jaguars season was the franchise's 17th season in the National Football League and the 9th under head coach Jack Del Rio, who was fired on November 29 and replaced on an interim basis by defensive coordinator Mel Tucker.
 The team had hoped to improve on their 8–8 record from 2010, but exceeded their loss total in Week 13, and were officially eliminated from postseason contention.
 With the 10th pick in the 2011 NFL Draft, they selected quarterback Blaine Gabbert from the University of Missouri, and Gabbert would replace Luke McCown as the starting quarterback in Week 3.
Enrique Del Rio (born May 28, 1966) is a Mexican "Luchador" "enmascarado", or masked professional wrestler who has worked for Lucha Libre AAA World Wide's (AAA) "Mini-Estrella" division since AAA was founded in 1992.
 Del Rio currently works under the ring name Mini Psicosis, a smaller version of Psicosis II, and is a former AAA World Mini-Estrella Champion.
 Until 2008 he worked as Jerrito Estrada, a smaller version of the wrestler Jerry Estrada.
 As Estrada Del Rio has held the Mexican National Mini-Estrella Championship once, being the shortest reigning champion in the title's history.
 Working in the Mini division does not automatically mean that he has dwarfism as several short wrestlers work in the "Mini" division, including Enrique Del Rio.
Santa Maria del Rio is one of the 58 municipalities that make up the Mexican state of San Luis Potosí.
 The municipality is located in the southern part of the state, approximately 48 kilometers east of the city of San Luis Potosí.
 Santa Maria del Rio has a land area of 1,655 square kilometers, with 37,290 inhabitants.
 s of 2005 , 12,000 were living in the town of Santa Maria del Rio.
 The area is famous for its "rebozos", being the cradle of the blue and white "rebozo de bolita."
 The Rebozo Caramelo is woven there.