We compare various compensation methods for the EQUATOR system and for several modifications of the airborne electromagnetic system ЕМ4Н: with a transmitter loop attached to the fuselage of Mi-8 helicopter, with a loop attached to the fuselage of An-3 aircraft, and with a loop towed by Eurocopter AS350B3. We consider two ways of the transmitter signals interference modelling: in the form of a stationary systematic component of the measurements and in the form of a stationary field vector rigidly connected to the transmitter. To implement the second approach, the ЕМ4Н and the EQUATOR use two additional dipoles to determine the relative location of the transmitter and the receiver. At high altitude, in the absence of a response from the ground, the following statistical parameters of the signals remaining after interference compensation were analysed: the standard deviation and the difference between the minimum and the maximum values.