In April British Airways and other carriers were forced to cancel hundreds of flights following a surge in infections requiring staff to isolate. Crew rosters have been hard to predict and schedules had to follow.
Experts predict a further 12 months of travel chaos as new crew are trained to replace redundancies.
EasyJet says that the changes to their A319 fleet will allow them to operate with more certainty and meet CAA safety standards. The airline expects close to 300,000 passengers a day this summer, almost the pre-pandemic peak.
Cancellations from crew shortages have reportedly left passengers 'stranded' over the Easter break, blaming "higher than usual levels of staff absence". 100 EasyJet services and 60 BA flights were cancelled, causing travel chaos that was compounded by disruptions to P&O ferry routes.
UK transport secretary Grant Shapps recently allowed airports to begin training staff without security clearance after it emerged delays in granting clearance were holding up training for additional UK flight crew.
Additional shortages in airport and border force staff have meant that disruption could continue well into the year. Heathrow Airport and the Immigration Services Union told the BBC that travellers should prepare for a "very difficult summer".