interesting i saw this on united.com but i dont think its ever enforced [for itineraries not bookable online]
Most travel award itineraries may be booked at united.com. Certain travel awards may only be booked over the phone with your local United Customer Contact Center, such as flights operated by certain carriers. An award booking service fee will apply to all bookings made over the phone, regardless of whether it is possible to be booked at united.com. Please see the award fee chart for more details.
