British Airways owner International Airlines Group (IAG) and budget carrier easyJet will reveal the impact of terror attacks in Egypt and Paris when they post their latest passenger traffic numbers on Thursday and Friday respectively.
Both airlines will reveal their November numbers after both carriers in the last few days cancelled all flights between Sharm el-Sheikh and the UK until January following the suspected bombing of a Russian passenger jet.
Flights were halted after the UK government said the plane crash in the Sinai desert, which killed 224 people at the end of October, may have been caused by a bomb.
BA said the decision was made following discussions with the UK government - while carrier Monarch, and holiday firms Thomson and Thomas Cook have also cancelled flights.
In the last few days Thomas Cook chief executive Peter Fankhauser said he had never experienced such ''unprecedented'' disruption in his 30-year career after the recent series of deadly terrorist attacks.
The holiday firm said so far the cancellation of holidays to Tunisia after the beach and hotel terrorist attacks in June, which killed 30 Britons, impacted its underlying earnings by around £22 million.
Last month IAG upgraded its annual profit guidance after growing passenger numbers and lower fuel costs led to strong third quarter results.
IAG, which in August added Ireland's Aer Lingus to its stable of airlines for 1.4 billion euro (£1 billion), said its full-year operating profit would range from 2.25 billion euro (£1.6 billion) and 2.3 billion euro (£1.7 billion), having previously forecast 2.2 billion euro (£1.6 billion).
The group said that, excluding Aer Lingus, it posted a third-quarter operating profit of 1.21 billion euro (£869 million), beating analysts forecasts of 1.19 billion euro (£855 million).
The group, which also includes Iberia and Vueling airlines, said in its third quarter to the end of September passenger unit revenue lifted by 6.5% and fuel costs fell by 8.6%, compared to a year ago.
The price of crude oil has fallen by more than half since last summer to around 49 US dollars (£32) a barrel due to a production glut, cutting costs of heavy users such as airlines.
Earlier this month easyJet has said the Paris terror attacks, which killed 130, will have a minimal impact on the budget airline as passengers will still want to travel.
EasyJet communications director Paul Moore added any disruption would be brief, adding that the airline had not changed its growth forecasts for 2016.
''Obviously our thoughts are with those affected,'' he said. ''But we have dealt with such events before and it is typically a short-term impact.
''Both in and out of Paris, people will continue to want to fly.''
The budget airline posted strong pre-tax profits of £681 million for the 12 months to the end of September earlier this month, in line with its upgraded guidance.
This is up £105 million on last year and represents the fifth straight year of record profits.
The firm also carried an additional four million passengers during the year, hitting a total of 68.6 million travellers.
Alton Towers owner Merlin Entertainments will update the market on its trading on Tuesday as it continues to count the cost of its major rollercoaster accident earlier this year.
Over the last few days it said the crash of its Smiler ride in June was caused by human error as staff misunderstood a shutdown message and wrongly restarted the rollercoaster.
Five people were seriously injured in the crash, which resulted in the 500-acre theme park in Staffordshire being shut down for four days.
Analysts at Jefferies said trading at the group, which also owns attractions such as Thorpe Park and Legoland, may also be impacted by the weak euro which has hampered tourism in the UK.
The broker added it did not expect much of a boost from Halloween period as Merlin management had forecast earlier.
Earlier this month the firm said that up to 190 jobs could go at its Alton Towers theme park after sales plunged following the crash.
It said: ''At the end of a very difficult year, Alton Towers Resort has confirmed a proposed restructure of the business to be completed in time for the opening of the new season in March 2016.
''Regretfully however, it may result in the loss of up to 190 salaried jobs across the resort."
In September, the company first revealed the impact the crash has had on the business as visitor numbers plunged at its theme parks over the peak summer season.
It said it saw like-for-live revenues tumble by 11.4% across its theme park division over the first nine months of its financial year after seeing ''significantly'' lower numbers of visitors to Alton Towers, while other UK attractions in the unit, such as Thorpe Park, were also hit.
It warned that annual theme park earnings would be at the lower end of expectations and would probably continue to be impacted over 2016 in the wake of the accident.
However, the popularity of its Legoland resorts helped shore up wider group trading, with overall like-for-like sales edging 0.3% higher in the 36 weeks to September 5.
Merlin has already warned over profits in the theme park business, saying in July that earnings would be between £40 million to £50 million, down from £87 million in 2014.
It now believes its theme park earnings will come in at the lower end of this range.
However, the wider group still expects to see profit before tax ''broadly in line'' with last year at £249 million this year, after savings in financing and other costs.
But analysts at Numis expect Merlin's annual pre-tax profit will come in at £239 million.
ends
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