Jet2 and British Airways have announced multiple flight delays, particularly affecting services from Belfast International, Bristol and Liverpool airports to popular holiday destinations.The disruption comes as the Met Office upgraded its weather warning to a red alert in some parts of the UK, prompting both airlines to take precautionary measures.Jet2 flights affectedLS377 Belfast – Tenerife SouthLS307 Belfast – Fuerteventura LS315 Belfast – Lanzarote (Arrecife)LS378 Tenerife South – BelfastLS308 Fuerteventura – BelfastLS316 Lanzarote (Arrecife) – BelfastLS1893 Bristol – Tenerife SouthLS1827 Bristol – FuerteventuraLS1891 Bristol – Tenerife SouthLS1801 Bristol – Lanzarote (Arrecife)LS1894 Tenerife South – BristolLS1828 Fuerteventura – BristolLS1892 Tenerife South – BristolLS1802 Lanzarote (Arrecife) – BristolLS3283 Liverpool – Tenerife SouthLS3284 Tenerife South – LiverpoolBritish Airways have had to reduce their schedule out of LondonPAJet2 said to customers: “If your flight is disrupted, we will be in contact with you directly via SMS and Email and post regular updates on the Jet2.com website.”We ask you to please ensure you check and update your contact information.”The major airline advised customers to allow plenty of time for their flights because of possible delays from the impact of Storm Darragh.Jet2 said: “If you are travelling with Jet2.com on other flights during this period, we are planning to operate these flights as close to schedule as possible, however, there may be some further disruption should the weather deteriorate.”We advise all customers to allow extra time to travel to the airport and check in as scheduled (our check-in desks close 40 minutes prior to your scheduled departure time) and our friendly Red Teams in the terminal will keep you up to date.”We will, where possible, board our flights for an on-time departure, however, please be prepared for a longer than normal wait either in the terminal or onboard the aircraft to depart.”We recommend arriving at the airport at least 2 hours before your scheduled departure time.”Jet2.com would like to apologise in advance for any disruption you may experience. Your comfort and safety is our number one priority, we will have you on the way as soon as possible”Many flights have been cancelled due to the stormPA British Airways has been forced to reduce its schedule too after the weather disruptions across the UK.It said: “To comply with air traffic restrictions imposed on us due to the weather conditions of Storm Darragh, we have had to reduce our schedule at our London airports.”Our phone lines are extremely busy as we assist customers in getting their travel plans back on track. “We kindly ask that you only contact us if your journey is due to take place in the next 48 hours in order to allow us to help affected customers more quickly.For customers who do not want to travel during the stormy conditions this weekend, British Airways is allowing them to postpone their travel until the following weekend free of charge.The global airline said: “We apologise for any potential impact on your travel plans. Thank you for your patience and understanding.”