Pure speculation: The part where the Delta team didn't want Microsoft's help feels like it is probably that they knew that their systems were a mess of old, unp

Pure speculation: The part where the Delta team didn't want Microsoft's help feels like it is probably that they knew that their systems were a mess of old, unpatched Windows clients and servers and were embarrassed about it (and that their legal teams probably knew that it was better to keep everyone out so they could sue later on)