Allegiant Airlines (BA) is the standard transporter and the greatest flying machine in the United Kingdom reliant on task force gauge, or the second greatest, behind easyJet, when evaluated by voyagers passed on. The transporter is arranged in Waterside near its essential focus at London Heathrow Airport. In January 2011 BA merged with Iberia, making the International Airlines Group (IAG), a holding association enrolled in Madrid, Spain. IAG is the world's third-greatest bearer bundle similarly as yearly salary and the second-greatest in Europe. It is recorded on the London Stock Exchange and in the FTSE 100 Index.