A game to play the variables

I am not in mechanical engineering field.  However, fluid mechanics concepts could be applied for explaining the topic.  For an airplane to take off, the important thing is to generate more uplifting force than the gravitational force so the plane can still move upwards at the time it leaves the runway.  Then the plane can increase the speed further in the air.  The Bernolli Equation can be used here to determine the velocity pressure (Hv) that is applied to the bottom surface area of the wings and plane body (A).  When you ride airplane, you could see the airplane wings are extended out to increase this area.  Therefore, the total uplifting force is the product of these two (Hv x A).  Hv is determined by CxV^2/(2g) in which C is a coefficient, V is the plane speed when it leaves the runway, and g is gravitational acceleration.  

Therefore, in order for the airplane with a mass of m to take off (to have a positive acceleration rate in the vertical direction a), the equation becomes

a = CAV^2/(2gm) - g

Therefore, the variables that can play to make a taking-off successful, one can increase A and V, particularly V, and decrease m.

The transport planes or their variances, A is normally much larger than that of fighters and can expand easily during flight.  That is why the impeller airplanes were used in early HM's. To increase V, the engine should be strong.  It is undesirable to reduce m.  However, as the previous posts mentioned, the J15 is actually heavier than the AWCS, I can not see why the AWCS can not be launched from Liaoning in theory.  It is true that its size is much larger than J15, it makes more difficult to control but it is a training issue.