TUI and easyJet have issued an urgent warning to passengers going on holiday over the Easter break.
Airports across the UK have been faced with delays and disruptions over recent weeks, with reports of passengers waiting hours to get through security or check-in.
It comes as airlines have been forced to cancel flights across the UK with crippling coronavirus-related staff shortages grounding routes.
With the four-day Easter weekend coming up, TUI and easyJet have warned passengers over security delays at airports.
TUI issued an update on its website and stated: "We are aware of security queue delays at some airports, predominately Birmingham and Manchester.
"We are working closely with our partners to monitor the situation and open check-in as early as possible.
"We advise customers to please plan to arrive at the airport and proceed to check-in as normal, keeping in mind that standard check-in opens at least two and a half hours before departure time for short and mid-haul flights, and at least three and a half hours before departure for long-haul flights."
The airline urged people to consider its Day before Bag Drop and Self Service Bag Drop to keep queuing to a minimum before their holiday.
Customers travelling with just hand luggage can also check in online via Manage My Booking and simply proceed straight to departures.
TUI said it is directly contacting all our customers travelling in the next two weeks to offer additional guidance on travelling throughout the busy holiday period.
EasyJet urged passengers to get to the airport two hours before their flight.
In an update by easyJet Operations Control within the last 11 hours, the operator said: "There may be delays at the airport security control before your flight and we recommend that you arrive at the airport 2 hours before your flight time.
"Please have your bags ready before you go through security, making sure that any liquids are carried in a see-through and resealable bag, and that any electronic items are carried separately.
"The boarding gate will close promptly 30 minutes before the scheduled departure time. Please share this message with any other customers who are travelling with you."
The carrier also sent an email to passengers who are set to fly with them soon with the same message.
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