The Boeing 737 model involved in Sunday's crash is among the most widely used aircraft in the world, though a handful have been involved in fatal accidents.Benard /Andia/Universal Images Group/Getty ImagesSunday's Jeju Air crash has again raised concerns about flight safety.Boeing's 737-800 model is used by nearly 200 airlines and has a strong safety record.The 737-800 is different from Boeing's 737 Max family, which has faced significant issues.The Boeing plane that crashed in South Korea on Sunday, killing 179, has a remarkable safety record.The 737-800 model is among the world's most widely used passenger planes, with some 4,400 in service for nearly 200 airlines, according to data from Cirium.In its nearly 30 years of service, the 737 variant — much older than the problematic Max models — has seen 1,100 fatalities from 17 accidents, according to data compiled by the Aviation Safety Network, a nonprofit research organization.That's a relatively low crash rate, given the thousands of plane units produced and the millions of passenger flights completed.