Talking about "the composite material that made up the rudder and tail of the two planes" is like talking about the metal material that makes up the kitchen wrap foil and the wings.
Although fin and rudder are made from carbon fibre epoxy composites, that is all that is common.
The rudder is made of sandwich material with thin (less than 1 mm) carbon fibre skins on nomex/phenol honeycomb, while the fin is made of integrally rib and stringer stiffened thick (up to more than 10 mm) monolitic carbon fibre shells.
I´m not 100% shure, but I also think the rudder is made from bidirectional woven fabric prepregs while the fin is made from unidirectional fibre tape prepregs.
Finding "minor delaminations" in composites is like finding dents, loose rivets, small cracks or minor corrosion on metals. It weakens, but not below the tested strength level.
It´s a long way from pregnancy to maternity
