Before the modern jumbo jet and its first class suites, the biggest and grandest thing in luxury air travel was the German Zeppelin Airship.
Of all the massive Zeppelin's constructed, the most famous was the Hindenburg. The Hindenburg was designed to ferry passengers across the Atlantic in serenity, with the dirigible floating smoothly through the clouds.
The Hindenburg was the first of two "Hindenburg" Class airships constructed by the Zeppelin Company. Construction of the airship began in 1931 and was completed in 1936. The Hindenburg, along with its highly successful predecessor, the Graf Zeppelin, made numerous trans-Atlantic crossings in their brief but illustrious careers.
Constructed out of an aluminum alloy called duralumin, the Hindenburg's massive frame work was filled with 7 tons of hydrogen. Hydrogen is much lighter than air, and allows the massive Zeppelin to carry more people in greater levels of luxury. However, with an ignition source, an oxidizer, and right concentration, hydrogen can also be incredibly flammable.
The Hindenburg entered passenger service in May of 1936 and carrier up 50 passengers in luxury across the Atlantic.