Not an Airbus A321 aircraft announcement, But Jet2 have just put on sale another new Greek destination of Skiathos for summer 2020 along more flights added from Leeds/Bradford.
Flights to Skiathos start in May and will operate as follows
Birmingham = 1x weekly (Wed)
Manchester = 2x weekly (Wed & Sun)
London Stansted = 2x weekly (Wed & Sat)
Extra flights from Leeds/Bradford for summer 2020
Mahon = Increased 5x to 6x weekly
Arrecife = Increased 6x to 7x weekly
Las Palmas = Increased 4x to 5x weekly
Fuerteventura = Increased 3x to 4x weekly
Tenerife = Increased 8x to 9x weekly
Dalaman = Increased 6x to 7x weekly
Antalya = Increased 7x to 8x Weekly