The objective of this review is to provide a critical evaluation of li
near stability theory for wall-bounded shear flows, with an emphasis o
n results, not techniques. The results deal with applications to diffe
rent flowfields related to aircraft systems. Because the flight condit
ion is usually a low-disturbance environment, stability plays an impor
tant role in the transition process. Linear stability theory is not a
new topic, so emphasis is placed on the most recent accomplishments.