United Airlines is raising its fees for first and second checked bags, becoming the second U.S. airline to up the price this week. United is raising the price by $10 for flights in the U.S., Mexico and Canada and Latin America, the airline said Thursday in a statement, making the price for the first checked bag $45 for those who pay ahead of time and $50 for travelers who check their bag within 24 hours of their flight. The price for a second checked bag also gets bumped up to $55 for those who