We have studied the rate constants for the reaction of O+ with N-2 over the temperature range 300-1600 K and the reaction of O+ with O-2 over the range 300 to 1800 K. The results are in good agreement with previous measurements made up to 900 K. The rate constant for the O+ reaction with N-2 shows a minimum in the temperature range 1100-1300 K. The increase above this temperature is due to N-2 v = 2 becoming populated. The rate constant for O+ + O-2 shows a minimum in the 800-1100 K range. Comparing to previous drift tube measurements allows the rate constant for O-2 (v > 0) to be derived. The v > 0 rate constant is approximately five times larger than the v = 0 rate constant.