Originally Posted by
WineCountryUA
But limited to elites / eligible credit card holders.
Not anymore, as of at least June 2021, it's available for any mileageplus member, regardless of chase credit card holder status. If a supervisor or agent is still saying this, then they should double check the last seat availability policy. The only benefit of credit card or elite status is expanded saver availability, namely XN bucket. YN/JN is last seat availability for all.
Last Seat Availability Benefit
MileagePlus members have the benefit of booking awards without capacity controls on flights operated by United and United Express. If there is a seat available, these members have unrestricted access to book an award, even if it's the last seat on the plane.
https://www.united.com/ual/en/us/fly...vel/types.html