In the initial blurb but obviously part of a marketing ploy as PAX generally don't know A from B however it can be found here:
Jet2.com and Jet2holidays Land at Birmingham Airport | Jet2.com
They're pretty adamant they're brand new tho - lol
"-
FOUR BRAND NEW aircraft offering 590,000 SEATS"
"the flights will operate on FOUR of Jet2.com and Jet2holidays’
brand new Boeing 737-800 next generation aircraft"
"It’s fantastic to be bringing our friendly low fares, great value package holidays, plus our
brand new aircraft to Birmingham Airport"
"This friendly leisure airline is in response to customer demand offering great value deals to some of the most popular sunshine routes on
a fleet of brand new 737-800 aircraft.”