From equations of motion to aerodynamics, Wolfram|Alpha has aeronautical engineering calculators. Solve problems related to standard airfoils, airplane pressurization, rigid body rotation, indicated altitude (given the flight level and station pressure), indicated altitude (given the pressure altitude and station pressure), indicated airspeed, the slant range to aircraft formula, true airspeed (given the Mach number and altitude), true airspeed, the wind triangle and lift coefficient.
