'customers demands' is correct and usable in written English. You can use it whenever you're referring to the demands that customers put forward. For example, "Our aim is to meet and exceed our customers' demands.".
With custom order information, suppliers produce or assembly to meet their customers' demands as precisely and efficiently.
And Waltons has benefited from its big customers' demands.
With improvements in private-jet technology, customers' demands are altering and flights are getting longer.
Competitive markets force business leaders to heed their customers' demands all the time.
If customers' demands prevent this, it may help to focus variety on a few, important, features.
"Clearly there was commercial pressure" to meet customers' demands, said John Cane, a union representative.
In many cases small and rural providers were slow to invest in 3G technologies, but were encouraged to do so to meet their customers' demands.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia