Simon Browning and Daniel Thomas are both from the UK.
EasyJet blamed higher than usual levels of staff absence due to Covid for the cancellation of around 100 flights on Monday.
The airline said it tried to offset the problem by using a backup crew, but was forced to make some cancellation due to the problem.
As the Easter school holidays begin, demand for travel is on the rise.
Long lines for security and check-in have been caused by staff shortages at airports.
EasyJet said that the cancellation was a small part of its schedule on Monday.
As a result of the current high rates of Covid infections across Europe, easyJet is experiencing higher than usual levels of employee sickness.
It has been necessary to make more cancellation for today and tomorrow. We are sorry for any difficulties this may cause.
He said affected customers could rebook on alternative flights or get a voucher.
When travel restrictions are lifted, airports have seen staff shortages.
Some passengers missed their flights at the start of the Easter holidays because of long check-in and security lines at Manchester Airport.
There have been complaints about lengthy waits in the baggage reclaim halls.
The situation was horrible, and one traveller said they had seen customers and staff in tears.
Manchester Airport apologized and admitted that their experiences were below the standard they aim to provide.
After the most damaging two years in its history, our industry is facing staff shortages and recruitment challenges.
The removal of all travel restrictions after two years has seen a rapid increase in passenger numbers, which is putting an enormous strain on our operation.
There were long lines to enter Terminal 2 on Sunday. The airport blamed high passenger volumes and Covid checks.
Some travellers said they had waited hours to take off because of staff shortages and problems with the e-gate passport checks.
Our teams are supporting our airline partners to get passengers away on their journeys as quickly as possible and we apologize for any hassle this has caused.
As the Easter holidays kicked off, it was also having a busy weekend.
The security area has not seen a lot of lines, but some check-in areas are very busy.