On Sun, 21 Sep 2003 12:47:52 +0000, Jay Honeck wrote:

In fact, I can usually see the bondlines in the wing while in
flight, and you can bet any missing lines would get my attention
in a big hurry.

Just curious -- why are the bond-lines visible in flight?

They're even more visible on the ground.

A lot of the bondline is along the edges of structures; for example, the
trailing edge of the wing.

Bondlines internal to structures (for example, the wing ribs) can usually
be discerned by a slight irregularity of the skin.