The Air Force Research Laboratory (AFRL) at Kirtland AFB completed a comparison of the refractive index structure parameter (Cn2) using an instrumented Gulfstream II Aircraft and a ground based scintillometer located at White Sands Missile Range (WSMR), NM on 9 October 1997. The aircraft measured the atmospheric temperature structure parameter with aerothermal probes from which Cn2 values are derived, while the scintillometer measured the irradiance variance over the beam path from which Cn2 values are derived. Both systems provided horizontal information over the altitude of the beam path from the scintillometer and the altitude of flight from the aircraft. The results from the two sets of horizontal data are compared to each other and also with an average vertical Cn2 profile constructed from a series of thermosonde measurements taken at WSMR at an earlier date. A comparison of the data over the different topographical features between the two peaks, on which the scintillometer transmitter and receiver are located, is also discussed. Overall, the comparisons of Cn2 from the scintillometer and the aircraft show good agreement in the means and general trends over time