Aer Lingus A320 EI-DEJ operated an additional Dublin – London Gatwick sector this afternoon as EI2180. The aircraft was then intended to operate an additional London Gatwick – Knock rotation as EI2191/EI2192. However when operating EI2191 the aircraft diverted to Shannon due to weather at Knock. The aircraft then positioned Shannon – London Gatwick using EI2191 as its callsign before operating an additional London Gatwick- Dublin sector as EI2181.