Yes the answer by Philip is correct in this instance in regard to aircraft interiors, although in aircraft maintenance terminology, it usually refers to a pressure bulkhead, such as either side of the wheel wells, or at either end of the fuselage, such as between the cabin and the tail section.
Rainbow baby. A rainbow baby is a baby that is born following a miscarriage or still birth. In the real world, a beautiful and bright rainbow follows a storm and gives hope of things getting better. The rainbow is more appreciated having just experienced the storm in comparison. The storm (pregnancy loss) has already happened and nothing can change that experience. Storm-clouds might still be overhead as the family continue to cope with the loss, but something colourful and bright has emerged from the darkness and misery.
Meaning: An arc of colored light in the sky caused by refraction of the sun's rays by rain. Classified under: Nouns denoting natural objects (not man-made) Hypernyms (rainbow is a kind of...): arc; bow (something curved in shape) Holonyms (rainbow is a part of...): sky (the atmosphere and outer space as viewed from the earth)