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By the end of the 1920s, biplanes were becoming obsolete and manufacturers turned to building all-metal monoplanes. Boeing Aircraft led this technological revolution with welded steel tubing for fuselage structure. This soon became standard in the industry until it was replaced by monocoque sheet metal structures in the mid-1930s.

The propeller was also a source of controversy.

United Air Lines, a member of the holding company United Airlines and Technology Corporation (UATC), purchased 60 of the planes and soon outdistanced all of its competitors.

While by the 1930s, diesel engines were revolutionising rail transport, and giving birth to a burgeoning flight industry, on the sea and on rivers, steam was still king. Unlike with trains and aircraft, large ships remained in service for decades, meaning that many of the ships that transported passengers of the 1930s were built as early as the 1850s, and some ships built in the 1930s remain in service today. The steam turbine, first turned to use in seagoing vessels in 1897, was able to produce far more power than a traditional reciprocating steam engine. By the 1930s, all large ships were being built with such engines, allowing unprecedented speeds. For ships built in the thirties, the most popular fuel for running the boilers was no longer coal, but fuel oil. This meant that modern ships could run with a much smaller crew than earlier vessels. A typical small passenger steamer would have no more than a dozen crewmen, including a few stewards and cooks for the care of passengers. Larger vessels of course could have hundreds of crewmen (The Queen Mary, launched in 1936, had over a thousand), and were almost like floating towns, the crew forming their own community below decks.

lthough not the only passenger airplane. Boeing had introduced its Model 80 in 1928, which also was designed as a passenger transport.

The Ford's most common variant, the 5AT, introduced in 1928, accommodated 13 passengers in its earliest model and was modified to seat up to 17. With no air conditioning and little heating, the plane was hot in summer and cold in winter, and with no circulation system, its environment was made even more unpleasant by the smell of hot oil and metal, leather seats, and disinfectant used to clean up after airsick passengers.

The Boeing Model 80 had a higher 14,000-foot (4,267-meter) ceiling but was still subject to turbulence.

Meat is very rare as it costs too much for the majority of the population and to raise animals means to feed them the precious grains that could be used to feed people.

While cooking the following recipes, keep in mind that most Haitians do not have electricity. When these dishes are made, they are often made over open fires or in small ovens.

Anger over the cost of food got to be too much for hundreds of people who took to the streets across Haiti in protest in early April, burning tires and forcing businesses to shut down.

At least four people died.

The cost of basic food staples, including rice, beans and corn, has increased by an average of 50 percent in recent months in the Caribbean nation.

COVER STORY PODCAST Globalization has been brutal to midwestern manufacturers like the Pap

factory, its oiled wooden factory floors worn smooth by work boots, thrived by making ever-more-complex equipment to weave, fold, and print packaging for everything from potato chips to baby wipes.

Slide Show >> But now, Compton says, he is "probably the most optimistic I've been in five years." Hope is coming from an unusual source. As part of its turnaround strategy, Barry-Wehmiller plans to shift some design work to its 160-engineer center in Chennai, India. By having U.S. and Indian designers collaborate 24/7, explains Vasant Bennett, president of Barry-Wehmiller's engineering services unit, PCMC hopes to slash development costs and time, win orders