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Back on land, the challenge is being taken up by a range of players - from high-minded academics wanting to help lift rural populations out of poverty to internet giants keen to add them to their social networks.
Google, for example, is buying Titan Aerospace, a maker of drones that can stay airborne for years, while Facebook has bought UK-based drone maker Ascenta. CEO Mark Zuckerburg has said Facebook is working on drones and satellites to help bring the Internet to the nearly two thirds of the world that doesn't yet have it. As part of its Project Loon, Google last year launched a balloon 20 km (12.4 miles) into the skies above New Zealand, providing wireless speeds of up to 3G quality to an area twice the size of New York City.
But these are experimental technologies, unlikely to be commercially viable for a decade, says Christian Patouraux, CEO of another Singapore start-up, Kacific. Its solution is a satellite network that aims to bring affordable internet to 40 million people in the so-called 'Blue Continent' - from eastern Indonesia to the Pacific islands.
A mix of technologies will prevail, says Patouraux - from fiber optic cables, 3G and LTE mobile technologies to satellites like his HTS Ku-band, which he hopes to launch by end-2016. "No single technology will ever solve everything," he said.
Indeed, satellite technology - the main method of connectivity until submarine cables became faster and cheaper - is enjoying a comeback. While Kacific, O3b and others aim at hard-to-reach markets, satellite internet is having success even in some developed markets. Last year, ViaSat topped a benchmarking study of broadband speeds by the U.S. Federal Communications Commission.
And today's airline passengers increasingly expect to be able to go online while flying, with around 40 percent of U.S. jetliners now offering some Wi-Fi. The number of commercial planes worldwide with wireless internet or cellphone service, or both, will triple in the next decade, says research firm IHS.