REVENGE HOLIDAYS are in full swing and the travel industry is cashing in. After a rocky few years, the urge to splurge on airline tickets and hotels is set to bring in bumper earnings. Tour operators are inundated with bookings; hotel chains are raking in record profits. EasyJet has raised its earnings forecasts twice this year; IAG and Ryanair have both returned to profit for the first time since the start of the pandemic, and Singapore…