canyonblue737 said:let me end this entire discussion by saying that SWA uses an FAA approved and sophiscated onboard portable computer system which uses custom data for every runway in its entire system, combined with current weather, runway condition data, specific airplane model and tail number, aircraft weight, runway USEABLE LENGTH (made even shorter automatically in poor weather as a conservative factor), runway slope, obstacles, glideslope angle etc. to show specific landing margins and clearly state if you can safely land. this system is used for every single landing of SWA 3000+ daily flights and can be updated and checked on a moment to moment basis if necessary.
now that data is only good if sources coming from ATC and other planes is accurate.
Excellent response. Thanks