We report new models of absorption, excitation, and fluorescence spectra for joint excitations of the A<--X(0,0) band of NO and the B<--X bands of O-2. Supporting measurements obtained from the burned regions of flames operated at pressures from 1 to 10 atm are also presented. As developed through these models, a strategy appropriate for imaging planar laser-induced flourescence is proposed that, for lean combustion environments, should afford sensitive measurements of NO concentration through the use of a single excitation wavelength despite the photolytic interference from O-2 that intensities with increasing pressure and temperature.