Ryanair...
RUK...Ryanair UK will commence ops from a STN base it is planned in Jan`19..Utilize an initial single G-Reg airframe transferred from the main fleet for ops over UK domestics.
RYS...Ryanair Sun are operating over some services WMI/STN & KRK/STN during recent times...SP-Reg airframes & RYR flight numbers from their bases in Poland.