Airlines have given a slew of positive updates recently. It's been a good week for airline stocks, with United Airlines (UAL 8.76%) and others enjoying double-digit returns over the last week. For example, United stock is up 12.8% in the week to Friday morning. Airline stocks are flying There have been many positive trading updates and third-quarter guidance upgrades in the sector recently, and this week's move builds on it. Investors were concerned about relatively high interest rates putting pressure on c ...