A system for estimating a plurality of airspeed parameters for constantly calculating an airspeed of an aircraft, the system comprising: one or more processors; and a memory coupled to the one or more processors, the memory storing data comprising a database and program code that, when executed by the one or more processors, causes the system to: receive a plurality of operating parameters that each represent an operating condition of the aircraft; determine a stability-axis drag coefficient C D based on the plurality of operating parameters, wherein the stability-axis drag coefficient C D quantifies a stability-axis drag of the aircraft created during high speed conditions; determine a body-axis lift coefficient C L based on the plurality of operating parameters, wherein the body-axis lift coefficient C L corresponds to a lift of the aircraft created along a vertical body-axis during low speed conditions; estimate a high speed dynamic pressure Qbar drag based on the stability-axis drag coefficient, C D, and estimate a low speed dynamic pressure Qbar lift based the body-axis lift coefficient, C L; and estimate a dynamic pressure Qbar for the aircraft based upon a selection of either Qbar drag or Qbar lift depending upon whether the aircraft is determined to be operating at high speed or low speed conditions, respectively; estimate the plurality of airspeed parameters based on the dynamic pressure, Qbar. one or more processors; and a memory coupled to the one or more processors, the memory storing data comprising a database and program code that, when executed by the one or more processors, causes the system to: receive a plurality of operating parameters that each represent an operating condition of the aircraft; determine a stability-axis drag coefficient C D based on the plurality of operating parameters, wherein the stability-axis drag coefficient C D quantifies a stability-axis drag of the aircraft created during high speed conditions; determine a body-axis lift coefficient C L based on the plurality of operating parameters, wherein the body-axis lift coefficient C L corresponds to a lift of the aircraft created along a vertical body-axis during low speed conditions; estimate a high speed dynamic pressure Qbar drag based on the stability-axis drag coefficient, C D, and estimate a low speed dynamic pressure Qbar lift based the body-axis lift coefficient, C L; and estimate a dynamic pressure Qbar for the aircraft based upon a selection of either Qbar drag or Qbar lift depending upon whether the aircraft is determined to be operating at high speed or low speed conditions, respectively; estimate the plurality of airspeed parameters based on the dynamic pressure, Qbar. receive a plurality of operating parameters that each represent an operating condition of the aircraft; determine a stability-axis drag coefficient C D based on the plurality of operating parameters, wherein the stability-axis drag coefficient C D quantifies a stability-axis drag of the aircraft created during high speed conditions; determine a body-axis lift coefficient C L based on the plurality of operating parameters, wherein the body-axis lift coefficient C L corresponds to a lift of the aircraft created along a vertical body-axis during low speed conditions; estimate a high speed dynamic pressure Qbar drag based on the stability-axis drag coefficient, C D, and estimate a low speed dynamic pressure Qbar lift based the body-axis lift coefficient, C L; and estimate a dynamic pressure Qbar for the aircraft based upon a selection of either Qbar drag or Qbar lift depending upon whether the aircraft is determined to be operating at high speed or low speed conditions, respectively; estimate the plurality of airspeed parameters based on the dynamic pressure, Qbar.