This app was created, to practice the calculations off the VAPP and the RLD or FOLD, for the following A321 models: A321-231 IAE, 251N and the 251NX with CFMI engines. The tables used for the calculation are, the ones found in the QRH, IN FLIGHT PERFORMANCE chapter, "VAPP DETERMINATION WITHOUT FAILURE". All the corrections including the "SPD" are calculated automatically (remind that any "PILOT VREF CORRECTION" will be added to the "SPD" correction).The FOLD calculation is achieved by adding xx% to the corrected landing distance.