By Guy Taylor British Airways owner IAG is set to report a record €3.5bn (£3bn) annual operating profit next week after cashing in on the boom in travel demand last year. Total sales are also expected to reach historic levels of €29.4bn, marking a 27 per cent year-on-year increase. Flight demand soared in 2023 as consumers around the world started travelling again as Covid-era travel restrictions were dropped. But despite a string of record results, shares in British airways parent company, which also owns Iberia, Aer Lingus and Vueling, have fallen around 10 per cent in the last 12 months. In…