Hi Basics,
it means that aerodynamic center in A320 lies beyond 45% chord... could that be true?
From FCOM DSC -20 Principle Dimensions:
"CG limits are given in percentage of the reference chord length aft of the leading edge.
The reference chord length is 4.193 m (13.76 ft). It is 16.31 m (53.51 ft) aft of the aircraft nose.
The CG must always be within these limits, regardless of fuel load."
The main wheels are 17.7 m behind the nose, and the C of G is always forward of the main wheels.
The reference chord leading edge is therefore close to where the wing intersects the fuselage.
The swept wing has the centre of pressure further aft, so the C of G is always forward of the Centre of Pressure.