Luke, my question is, what does GSX consider to be the maximum payload for the 777 and the MD-11. In the case of the 747-400, for whatever reason, GSX is showing the maximum payload to be outrageously high numbers, and I've not figured out why that is. For the passenger variant, if I put 100% payload, the maximum should be 148,412 pounds, yet for some reason, GSX seems to think it's 443,489 pounds. For the freighter, if I put 100% payload, the maximum should be 248,600 pounds, yet for some reason, GSX seems to think it's 510,595 pounds. In your GSX settings, go to troubleshooting, then make sure you enable logging. When you start boarding, open up Couatl.log, which can be found at C:\Users\(Your User Name)\AppData\Roaming\Virtuali, and see what values it gives you for the payload, which should be at the bottom of the file. I'd be curious as to what GSX thinks the maximum should be.