if(angle < flightPathAngles.at(0) || angle > flightPathAngles.at(flightPathAngles.size()-1))
    {
        cout << "Error: Angle out of range." << endl;
        return 0;
    }

    for(unsigned int i = 0; i < flightPathAngles.size(); i++)
    {
        if(angle == flightPathAngles.at(i))
        {
            return flightLift.at(i);
        }
        else if(angle > flightPathAngles.at(i) && angle < flightPathAngles.at(i+1))
        {
            double slope = (flightLift.at(i+1) - flightLift.at(i)) / (flightPathAngles.at(i+1) - flightPathAngles.at(i));
            double lift = slope * (angle - flightPathAngles.at(i)) + flightLift.at(i);
            return lift;
        }
    }

    return 0;