"During a conference call with analysts and journalists, the Chicago-based carrier also said it had converted orders for Boeing 787-8 Dreamliners to 787-10 models, a move that defers the delivery date to 2022 and beyond from 2017 to 2018 currently."
"United Airlines said it is looking for used aircraft to adjust capacity and lower its capital expense, and noted it had recently purchased two used 737-700s from a leasing company that it declined to name. (Reporting by Alwyn Scott, Editing by Franklin Paul)"
From the chart below there are no backlog for 787-8's so this mean there are some option aircraft moving to a firmed order number for 787-10's from optioned 787-8's classification or they are taking from outstanding 787-9's not yet delivered which they have in abundance at this time , counting that still has 25 787-9's net yet delivered. Reuters likes to confuse sometimes when not fact checking.
|Customer Name||Customer Code||Model||Ordered||Delivered||Undelivered||2012 787-Deliveries||2013 787-8 Deliveries||2014 787-8 Deliveries||2014 787-9 Deliveries|
|United Air Lines||UAL/CAL||787-8||12||11||1||6||2||3|
|United Air Lines||UAL/CAL||787-9||26||1||25||1|
|United Air Lines||UAL/CAL||787-10||27||0||27|