Ryanair chief executive Michael O’Leary. As gridlock gripped Dublin’s roads in the early years of the century, he bought a taxi licence and plate for his own car, allowing him to use bus lanes to sail past bumper-to-bumper traffic on the way to his office at the airport every morning. File photograph: Jonathan Brady/PA Wire

In 2001, British Airways’ budget offshoot Go began flying from Dublin to Glasgow and Edinburgh. “It’s about time Irish travellers had the opportunity (...)