'404 — Plane Not Found'

Alleged ISIS sympathizers have defaced the Malaysia Airlines website with propaganda and caustic messages. The airline lost two jets last year with the disappearance of MH370 and the shooting down over Ukraine of MH17.

Hackers going by the name “Cyber Caliphate” scrawled on www.malaysiaairlines.com: “ISIS WILL PREVAIL.” The airline’s ticket booking and other services were unavailable as of Sunday night Eastern.

The homepage displayed a full-screen picture of a Malaysia Airlines A380 plane and the messages “404 — Plane Not Found,” and “Hacked by Cyber Caliphate.”

A rap song played in the background, according to CNBC.