Ryanair has issued a series of messages to travellers, including a reminder that "bad behaviour won't fly". The budget carrier is renowned for its no-frills travel options, alongside its cheeky social media updates. Ryanair shared a series of Instagram posts on Thursday, one of which implored passengers not to wander around the aircraft, blast films out loud (without headphones), or leave litter behind. Another post featured a list of "Ryanair red cards", jokingly suggesting these include flying in jeans, going barefoot during the journey, and clapping upon landing. Asking about Wi-Fi on board and 'hogging' both arm rests also made the list. Elsewhere Ryanair said it is marking its 41st birthday, having been operating since 1985. To mark the occasion, Ryanair is offering substantial discou