When was the last time you flew? Do you normally check or carry-on your luggage? Do you remember paying extra fees? Airlines love them, and the multitude of fees they charge is bringing in millions each year. This past week, Delta Air Lines, United, and Continental raised baggage fees. Are airlines going too far?

Airlines continue to push for new fees as they continue to report losses. With an upswing in fuel prices and reduced demand, airlines struggle to maintain profitability. Yet, budget and low-cost airlines saw a small turn-around, and are likely to recover quicker than legacy carriers (like American, United, and Delta).

On full flights, gate agents and flight attendants are frequently forced to gate-check baggage – which usually is free of charge. If it can fit the dimensions and get past security, you can usually gate-check your baggage for free; a great method to get around baggage fees.

They charge for almost anything, aside for the seat and small amount of baggage space in the overhead bin. Even a small container of Pringles can cost you $7 – they have you; where else are you going to buy it? Answer: the airport terminal.  Before your flight, it's a good idea to grab food inside the airport terminal. The cost of food and drink tends to be much cheaper inside the terminal.

Seattle's own Alaska Airlines began charging customers a $15 fee for the first checked bag last summer. Spokeswoman Marianne Lindsey said the decision was made on the basis of competitors, and it brings in an estimated $70 million a year. "We just couldn't continue not to charge," Ms. Lindsey told MSNBC. If you fly Southwest Airlines, two checked bags are included in the fare. If you do not, and plan to check bags, be sure to check Airfare Watchdog's baggage fees chart.