Originally Posted by
MSPeconomist
Are there ever situations where it's impossible to satisfy both constraints simultaneously? In other words, can the fuel required for the farther alternative airport be too much to landing weight at the destination or other alternative airport?
Sure, it's possible, but fairly rare. Payload Optimization tends to fall into two instances: One is when trying to protect max landing weight on bad weather days at destination that require distant alternates. The other is trying to protect Takeoff weight that is limited by runway or climb restraints often on hot days or high altitude airports