1. A system for generating, in a first aircraft in flight, a display indicative of feasibility of a weapon carried on the first aircraft or a second aircraft, respectively, successfully engaging the second or the first aircraft, respectively, the system comprising: a display screen for displaying the display indicative of the feasibility of the weapon; a first generator for generating a database describing a performance envelope of the weapon, the database stored on a non-transitory storage medium; a second generator for creating coefficients characteristic of the performance envelope by: a) generating candidate polynomials having a form of a generic algorithm, variables of the polynomials being some or all of a group of weapon or aircraft firing condition parameters; b) for each candidate polynomial, computing coefficients for that candidate polynomial which best fit that candidate polynomial to the performance envelope of the weapon using a criterion of least square error; c) for each candidate polynomial, generating a candidate score according to quality of fit of that candidate polynomial to the performance envelope of the weapon; and d) applying a genetic algorithm to the candidate polynomials and scores including selecting best scoring polynomials and discarding other polynomial(s); an uploader for uploading the coefficients to the first aircraft; and a reconstructor on the first aircraft containing the generic algorithm and configured to select the coefficients for the generic algorithm according to conditions of the first aircraft and the second aircraft and, using the selected coefficients, generate the feasibility display.