W&B: The input layout is divided into 4 sections (SETUP, PAX, CARGO, FUEL). Whenever you enter anything into one section, your weights instantly calculate. Problem with that layout is that if you get disrupted during your W&B calculations, you cannot easily see (and the OPT will not warn you) that you for example forgot to put in Taxi or Trip fuel. - T/O MAC: You have to find in in the chart, it could be displayed next to or below the Take-off PERFORMANCE: All selections are in green once selected. There should be other colors used for non-standard selections like A/C OFF, ANTI-ICE ON, REV NO CREDIT and most importantly NNC selected. WIND: You have to type in / in order for the app to realize the wind is not a HW of 03020 but rather 030/20 T/O weight: The TO DISPATCH output: Is cluttered, the output which will be loaded into the FMC could be highlighted. For example derate is on the same level as SEL TEMP even though it is not a heading but a setting... Engine Out: The procedure is displayed behind 2 submenus - Airport Info - Runway Comment. This should be displayed below the performance calculation. What I like is graphical depiction of the Take-off and landing calculation