[WalterBright]

It turns out that airplanes are fairly resistant to bombs aboard. Several attempts with smaller bombs have failed, despite causing significant damage. The cockpit door has been hardened, too.

Airliners are now pretty resistant to engine explosions, once thought to be impossible to do.

Keep in mind that a bunker will never fly.

Nobody is suggesting not going after criminals who attack software.

[salawat]

The cockpit door being hardened introduces its own set of problems as well, and the engine failure containment is a good point.

Though the prevailing logic on a bunker taking flight is that the engine size will be too large to be economical, which you probably factor in, Walter, but the uninitiated in the aerospace industry tend to simplify away.