Across the country, big jets are disappearing -- nudged shoved aside by the little guys, which are cheaper to operate and don't require as many butts to fill seats.

The number of empty seats falls, and revenue per available seat-mile (RASM) goes up. It's pretty straightforward. But, for crowded flights, this could leave a few people stuck without their preferred routes. The alternative, of course, is an unsustainable status quo, in which a few passengers remain happy ... until the airline folds.

American Airlines had yet another difficult quarter, not unexpected in what has become an incredibly deep travel slump. The carrier's parent company, AMR Corp. (NYSE: AMR), reported a third quarter loss of $359 million, largely because there aren't as many business travelers taking to the skies. Corporate travel budgets in all industries are having an effect on all airlines, including AMR.

Revenue plunged 20.2% year-over-year for the third quarter for the nation's second airline. The loss comes after a $31 million gain last year. This quarter's losses would have been slightly better if write-downs for sold or grounded aircraft were excluded -- the loss would have been $265 million (93 cents a share) on revenue of $5.09 billion. With the write-downs, revenue clocked in at $5.13 billion. Cheaper fuel made the quarter a little easier for AMR to bear, as well, with this expense down 47% year-over-year.

If you think all those new airline fees were a temporary measure to help these beleaguered companies through an economic crisis, you're out of your mind. Now that they've had a taste of how much they can make by charging you for an extra bag or a little more leg room, they're hooked. More important, the fees are making up a meaningful portion of airline revenues and profits, so investors aren't likely to be satisfied with a return to normal – well, they can't. Extra fees are the new "normal."

Business travelers still aren't coming back to the good seats, despite airlines' best efforts. FareCompare.com reports that many business class tickets to Europe are going to be 33% to 66% cheaper this fall relative to last year. Companies are being careful with their cash – which means stacking people in coach rather than giving them a little leg room on overseas flights. With back-of-the-plane tickets going for a quarter of the price (or less) than their business class equivalents, this isn't exactly shocking.

On Wednesday, Delta's (NYSE: DAL) cheapest NYC-to-London's cheapest roundtrip coach fare was $716 (for an October 23 departure and October 30 return), according to a report in USA Today. To take the same trip in business class, you were looking at a hefty $4,634. So, even though prices are down year-over-year, it doesn't mean that business travelers are being allowed to enjoy the opportunity.

Bigger fees are compensating for shorter flight manifests. For the first half of 2009, airlines in the United States have raked in $3.8 billion from cancellation, re-booking, checked bag and other fees. Data from the U.S. Department of Transportation puts this result up from the $2.3 billion airlines generated from these fees in the first half of 2008.

While passengers haven't been thrilled with these additional charges, the airlines have had to compensate for a significant drop in passenger traffic, as the industry copes with the worst travel session since the terror attacks of September 11, 2001.

Delta Airlines (NYSE: DAL) is looking to buy a piece of Japan Airlines (OTC: JALSY). The move could give the world's largest airline access to more cities in Japan.

A source close to the talks says that the investment would be several hundred million dollars and would open the door for an alliance between the two that would allow each airline to book passengers on the other's flights.

August brought more misery to the airline industry in the United States. Seven of the country's nine largest carriers saw traffic drop, with only Southwest Airlines (NYSE: LUV) and JetBlue Airways Corp (NASDAQ: JBLU) bucking the trend. The continued upward climb of unemployment, tighter corporate budgets and sluggish demand for leisure travel has resulted in fewer passengers in seats.

JetBue was the only carrier not to report a drop in available seat miles (ASMs), the primary measure of airline productivity. Load factors, however, which indicate how full a plane is, tended to be higher, largely a result of flights that have been cut in an effort to reduce costs.

Earlier this morning, Continental Airlines (NYSE: CAL) announced that it will cut 1,700 jobs, along with raising fees for checking luggage. CAL tagged this news along with its quarterly earnings report, in which it reported a loss of $1.72 per share. In the same quarter a year ago CAL lost a nickel per share. Excluding one-time items, CAL lost $1.36 per share compared to estimates for a loss of $1.35 per share. Quarterly revenue slipped 22.7% to $3.13 billion in the quarter, just shy of the consensus estimate.

Staff cuts are coming for Singapore Airlines (OTC: SINGF) with calendar Q2 "almost certain" to be a money-loser. This won't be a first for the carrier, but it's definitely rare. Since going public in 1985, SINGF has only had one quarterly loss until now. It took the SARS epidemic to put this company into the red for three months, back in 2003. According to four of the five analysts polled, there was little the company could do to avert the situation.

In a respectable move, the staff cuts are following that of the executive team, which has had 10% to 20% sliced from its salaries. An operating loss of $50 million or more for Q2 will cause staff paychecks to fall by at least 2.5%. SINGF is on the hook to cut 25% of the "monthly variable component" (MVC) that's included in staff salaries if the airline's loss pierces the $50 million threshold. MVC disappears in its entirety if the loss passes the $200 million mark. Currently, MVC accounts for only 10% of employees' total compensation.

Employees have already been chipping in to reduce the airline's costs. Pilots, for example, have sacrificed 65% of a day's pay every month, and employees in general are working shorter weeks.

But, this hasn't been enough.

AMR Corporation (NYSE: AMR) got spanked in the second quarter, as frequent fliers kept their feet on the ground. The American Airlines parent posted a $390 million loss in a quarter that historically has been kind to travel companies. AMR rationalizes the results with the thought that the loss would have been only $319 million ($1.14 per share) if charges related to selling and grounding planes were excluded. This would have put the airline ahead of analyst expectations of a $1.28 per share loss. AMR's Q2 revenue fell 21% to $4.89 billion.

And, it's far better than the airline's performance in the second quarter of 2008.

Continental Airlines (NYSE: CAL) just got the relief it needs to compete. Despite resistance from the Department of Justice (which can only recommend), the Department of Transportation has granted the airline immunity from antitrust laws. This clears the way for Continental to work with United Airlines (NASDAQ: UAUA) -- and other carriers -- on international routes. Now, the airline can join Star Alliance, which already has antitrust immunity.

At the same time, DOT approved a joint venture among Continental, United, Lufthansa (OTC: DLAKY) and Air Canada. This new relationship would involve trans-Atlantic routes.

Republic Airways Holding Inc. (NASDAQ: RJET) is going shopping. Only a day after making an offer for ailing Frontier Airlines (OTC: FRNTQ), it has made a bid to nab Midwest Airlines from private equity firm TPG Capital. The offer consists of $6 million in cash and a note for another $25 million. If the private equity house takes the deal, Republic will get 100% of Midwest's equity and TPG's secured note of $31 million.

The $25 million in debt is convertible to RJET stock at $10 a share, which gives TPG a bit more upside from the transaction. The seller would also have the right to nominate a member of the buyer's board of directors.

Of course, Republic's CEO, Bryan Bedford, is upbeat about the prospect of buying Midwest Airways, saying it will "enhance the strategic positioning" of his company. Like the proposed acquisition of Frontier, Midwest would continue to operate under its own name, though the target's Boeing 717s would be replaced with Embraer 190s.