The consumer champion carried out a mystery shopping exercise that involved contacting British Airways, easyJet, Jet2.com, Ryanair and Tui, to assess the accuracy of information they were giving to travellers on testing requirements.
Posing as passengers, Which? phoned the customer service lines for the airlines three times each and asked the same four questions about testing requirements when flying to Portugal.
At the time of the research, passengers were required to take a test regardless of vaccination status. Only PCR tests were accepted for entry to Portugal, and only children up to the age of two were exempt.
