Boeing stock fell more than 5% early Monday after a Jeju Air flight carrying 181 passengers and crew traveling from Thailand to South Korea crashed on landing Sunday, killing 179. This is what investors need to know.

Boeing Co.’s stock was down Monday after a deadly crash in South Korea, but its bonds were holding up. Boeing Co.’s stock fell Monday in the wake of a deadly plane crash in South Korea, but the aerospace giant’s bondholders seemed unfazed.

Boeing shares were down as much as 6% Monday morning. Authorities in Korea believe a bird strike could have been a factor in the fatal crash.