Booking.com uses it alot. They have a MASSIVE fax system for servicing European hotels because many of them (generally smaller ones) aren't connected in any mea

Booking.com uses it alot. They have a MASSIVE fax system for servicing European hotels because many of them (generally smaller ones) aren't connected in any meaningful way. So when Booking.com makes a reservation they fax confirmation details to the Hotel. The hotel can also make modifications by faxing details back