Flights to and from Heathrow continue to be disrupted after the airport was hit by a technical issue.
At least 58 of the day's arrivals - equivalent to 9% - were cancelled due to the knock-on effect of the problem, which emerged on Sunday.
A further 30 departing flights were also grounded from what is the UK's busiest airport.
All the flights affected on Monday were operated by British Airways, which is the largest airline at the west London hub.
On Sunday, some 73 departures and 60 arrivals from various carriers were cancelled.
Heathrow apologised for the disruption and said extra staff had been drafted in to help with directing people to their gates.
The situation at the airport on Sunday was described on Twitter by one passenger as "utter chaos".
Jenny Nielsen tweeted pictures of whiteboards displaying handwritten flight numbers and destinations.