More Monday merger fun, this time from the airline sector. Reportedly, Southwest Airlines (LUV) announced that it will purchase AirTran Airlines for roughly $1.42 billion.

This move will be funded mainly with debt, and it will help Southwest establish a larger presence in cities like Boston and New York. What's more (as the article points out), Southwest will now be in "head-to-head competition with Delta Air Lines in Delta's home base of Atlanta."

Analyst Upgrades

• Keefe Bruyette upgraded East West Bancorp (EWBC) to outperform from market perform after the company acquired assets from Washington First International Bank. The firm has a $21 price target for shares.
• Piper Jaffray upgraded Amylin (AMLN) to overweight from neutral, citing valuation and Bydureon's profile. The firm maintains a $26 price target for shares.
• Soleil upgraded MGM Mirage (MGM) to hold from sell, citing signs of stabilization in Vegas and valuation. The firm upped its target for shares to $13 from $11.10.
• T. Rowe Price (TROW) was upgraded to outperform from market perform at FBR Capital.
• JetBlue (JBLU) was upgraded to buy from neutral at BofA/Merrill.
• NetEase.com (NTES) was upgraded to buy from hold at Standpoint Research.

Early this morning, United Airlines (UAUA) and Continental Airlines (CAL) announced that they will join forces to create the world's largest airline in a $3 billion deal.

The new airline will be bigger than Delta Air Lines (DAL) and will send flights as far as Shanghai and South America. The companies believe that the span of destinations should attract more business travelers and their higher fares. The deal, which will need approval from shareholders and antitrust regulators, is expected to close in the fourth quarter. The new company will be known as United Continental Holdings and will be based in Chicago. The airline's largest hub will be located in Houston.

No profit no bonus -- hell, make that no salary. The new CEO of Continental Airlines (CAL), Jeffery Smisek, says he won't take any salary or annual bonus until he brings the airline to profitability.

Smisek took the top job at Continental after the previous CEO, Lawrence Kellner, left the gig to go to a private equity firm. Last year, the firm lost $367 million in the first three quarters. A Thomson Reuters survey of analysts expects a fourth quarter loss of at least $38 million, though they're looking for a profit of at least $190 million for this year. So, Wall Street has already set Smisek's goal for him.

Here are some highlights from last week's earnings coverage from BloggingStocks:

• Amazon.com Inc. (NASDAQ: AMZN) met Q2 earnings estimates but fell short of revenue expectations.
• Coca-Cola Co. (NYSE: KO) lower Q2 results beat expectations, lifted by strength in non-cola beverages.
• Continental Airlines Inc. (NYSE: CAL) reported net loss was accompanied by a job cuts announcement.
• Ford Motor Co. (NYSE: F) surprised with a Q2 profit due mainly to a huge gain from debt reduction.
• Hasbro Inc. (NYSE: HAS) posted better-than-expected Q2 earnings due to Transformers and G.I. Joe toys.
• Hershey Co. (NYSE: HSY) posted strong numbers for Q2 and also raised its full-year guidance.

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.

Analyst upgrades:

• Citigroup upgraded Adtran (NASDAQ: ADTN) to Buy from Hold on expectations the company will benefit from the broadband Stimulus funds.
• Morgan Stanley upgraded Continental Airlines (NYSE: CAL) to Overweight from Equal Weight based on relative valuation and views the company as a "survivor." Additionally, the analyst lowered 2009 industry estimates but believes it is the last cut for the year and is incrementally more positive on the sector.
• Morgan Stanley also upgraded EXFO Electro-Optical (NASDAQ: EXFO) to Overweight from Market Weight based on valuation.
• Tata Motors (NYSE: TTM) was upgraded to Buy from Hold at Deutsche Bank.
• Ascent Solar (NASDAQ: ASTI) was upgraded to Neutral from Underweight at JP Morgan.
• Mechel Steel (NYSE: MTL) was upgraded to Neutral from Underperform at Credit Suisse.

What's holding the airline sector back, in addition to high jet fuel prices, and keeping the likes of AMR's (NYSE: AMR) American, Delta (NYSE: DAL), UAL's (NYSE: UAUA) United, Southwest (NYSE: LUV), and Continental Airlines (NYSE: CAL) from realizing their potential?

Many economists and analysts would agree that, along with other infrastructure and related investments, the nation's air traffic control system must be upgraded, if the United States seeks an air transportation system capable of maintaining a high level of safety -- and better service -- in the 21st century's more-crowded skies.

Further, that the United States has not already replaced an essentially generation-old air traffic control technology with a modern system is a serious demerit, and one that has -- through delays, cancellations, and other problems -- taken a toll on the flying public and the major carriers.

This post is part of a series on some of the most memorable companies that have disappeared.

With soaring fuel prices and declines in discretionary spending leading to bankruptcies and mergers among the airlines these days, one might forget that such things have often occurred in that industry since its early days. Take Eastern Air Lines, one of the first and longest-running of the so-called trunk carriers in the United States.

Eastern began as a mail carrier for the U.S. Postal Service in the mid-1920s but through acquisition and expansion came to dominate much of the domestic travel industry along the profitable East Coast corridor by the 1950s. Back then the company was widely known for its famous president, former World War I Ace, Eddie Rickenbacker.

The airline thrived into the 1970s, when it was one of the "big four" major U.S. airlines. In its time, Eastern pioneered the use of a worldwide computer reservation system and the all-jet mainline fleet. However, the carrier struggled after the Air Transportation Deregulation Act of 1978. Former astronaut turned CEO Frank Borman finally relented to corporate raider and union buster Frank Lorenzo's buyout offer in 1985. Valuable assets such as new aircraft, the East Coast shuttle service, lucrative fuel operations, and the worldwide travel agent computer system were sold off or shifted to Lorenzo's other carrier, Continental Airlines (NYSE: CAL). Deteriorating labor relations forced Eastern into bankruptcy in 1989, at the time the largest airline bankruptcy in U.S. history. The carrier ceased operations the day after the start of Operation Desert Storm in 1991.

MOST NOTEWORTHY:

• Merrill downgraded AMR Corp (NYSE:AMR), Delta Air Lines (NYSE:DAL), Continental Airlines (NYSE:CAL), US Airways (NYSE:LCC) and UAL Corp (NASDAQ:UAUA) to Neutral from Buy citing earnings risk this year from higher energy costs.
  
• Oppenheimer downgraded shares of Chelsea Therapeutics (NASDAQ:CHTP) to Perform from Outperform after their survey suggested physicians believe currently available generic treatments are adequate in neurogenic orthostatic hypotension, which could impact the company's lead drug Droxidopa.
  
• Clearwire (NASDAQ:CLWR) was cut to Sell from Hold at Citigroup on valuation, as they estimate fair value at $13.

• Goldman downgraded Kellogg (NYSE:K) to Neutral from Buy and Hershey Foods (NYSE:HSY) to Sell from Neutral.
  
• Piper lowered Orbitz Worldwide (NYSE:OWW) to Neutral from Buy.

• Lehman downgraded the airline sector to Neutral from Positive, citing higher fuel costs and the weakening economy. AirTran (NYSE: AAI) and U.S. Airways (NYSE: LCC) were downgraded to Equal Weight from Overweight. UBS said it can no longer recommend airline stocks due to weakening economy, high fuel prices, and less likely industry consolidation. The firm downgraded Continental Airlines (NYSE: CAL), Delta Air Lines (NYSE: DAL), Northwest Airlines (NYSE: NWA) and U.S. Airways to Neutral from Buy.
  
• Goldman removed shares of Siemens (NYSE: SI) from their Conviction Buy List as they believe the company may book additional charges of $1.2B this year.
  
• Jefferies cut Internap (NASDAQ: INAP) to Underperform from Buy as they believe the 10-K filing delay and revenue quality questions reduce visibility into the health of the business.

• Wachovia lowered Amgen (NASDAQ: AMGN) to Market Perform from Outperform.
  
• SI International (NASDAQ: SINT) was downgraded to Neutral from Outperform at Cowen.
  
• Citigroup cut Assured Guaranty (NYSE: AGO) to Hold from Buy.

In the airline industry, it seems that any deal will do. Northwest Airlines Corp. (NYSE: NWA) is already fairly far along in discussions about merging with Delta Air Lines Inc. (NYSE: DAL). Now UAL Corp.'s (NASDAQ: UAUA) United Airlines is talking with Continental Airlines Inc. (NYSE: CAL). But one set of negotiations in not enough for Continental. It is also talking to AMR Corp.'s (NYSE: AMR) American Airlines, according to The Wall Street Journal (subscription required). The paper reports "the talks were exploratory, and it isn't clear they will go further."

Airlines are seeking mergers under the premise that combining companies saves costs. While that is true to some extent, the marriages also hurt customer service -- badly. Putting together incompatible reservations and service operations can take years and be extremely complex, which can make it hell for consumers who just want to take an airplane ride from here to there. Bad customer service is a sure way to drive off fliers, and that is not good for revenue.

The savings in a merger also might not be as great as imagined. Fuel costs stay the same. The number of pilots and crews may drop some, but that can also cause labor disputes and strikes that interrupt service. The number of people needed to handle customer support and processing of reservations probably cannot be cut by much, especially if retaining revenue with unhappy fliers is important.

In an industry where mergers and Chapter 11 filings have been part of the landscape for decades, combining airlines may be no panacea. It is good to remember that the two most successful carriers in the United States, American and Southwest Airlines Corp. (NYSE: LUV) have never been much enamored of merging.

Douglas A. McIntyre is an editor at 247wallst.com.