![Passengers queue to check-in at Heathrow Airport's Terminal 5. PA](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/MROKNG6GKFBJ5FIKTL65DI7NWE?smart=true&auth=6a921a9ebcfdb86fd9aa3af638c3b38c90d6a7de2d477b4f8b92cdef5046ff6a&width=400&height=225)
Passengers queue to check-in at Heathrow Airport's Terminal 5. PA
Passengers queue to check-in at Heathrow Airport's Terminal 5. PAUK flight cancellations and Eurostar outages leave 'tens of thousands stranded abroad'
Major airlines including British Airways, easyJet and Tui pulled flights from schedules