The present paper discusses how a mechanistic design process evolved for airfields in Sweden and how it is being used. Also, a sensitivity study is presented showing parameter influence on the bearing capacity expressed in Pavement Classification Number (PCN). For example, how do revised asphalt strain criteria affect the resulting PCN-value? Other parameters included the stiffness of the asphalt layer, the base layer, and subgrade during the spring thaw period. An equivalent number of standard wheel load (ESWL) was calculated for some commonly used aircrafts on selected Swedish airfield pavements. These calculations were based on the tensile strain at bottom of the asphalt layer. Thus, the Aircraft Classification Number (ACN) derived in this manner could be compared to the existing status. The paper also discusses some future applications using high-speed rolling deflectometers.