Boeing KC-135A Stratotanker - NASA "vomit comet"

N930NA NASA aircraft
one of the last "Weightless Wonders" or "Vomit Comets" to use the KC-135 airframe (N931NA) The Reduced Gravity Program provides the unique "weightless" or "zero-g" environment of space flight for test and training purposes on a cost-reimbursable funding basis. This capability is ideal for the development and verification of space hardware, experiments, crew training and it is also ideal for doing basic research.