My story this week for CNBC online is all about the (possible) move to free Wi-Fi in the sky.

Who’s doing it? Should we have it? Will we have it? Give this story a read and let me know if you think we are indeed on our way to having free Wi-Fi in the sky:

It wasn’t all that long ago (2000 or 2006, depending how you measure) that being able to access the internet on an airplane was a pie-in-the-sky idea. 

Once the technology became generally available and airlines began equipping their planes with Wi-Fi service, passengers soon found they couldn’t bear to fly without it.

In 2013, 66% of passengers surveyed by Honeywell Aerospace said the availability of in-flight Wi-Fi would influence their flight selection.

By 2018, Inmarsat’s Inflight Connectivity Survey found that more than half (55%) of all airline passengers considered inflight Wi-Fi to be a crucial amenity. And almost as many (53%) said they’d be willing to forgo an alcoholic drink, tea, coffee, and other in-flight amenities in exchange for Wi-Fi access.

The price of staying connected in the sky

While free messaging is available on Alaska Airlines and Delta Air Lines and Southwest Airlines and on a variety of international airlines, most all domestic airlines levy a charge for accessing the internet for email, streaming and other purposes.

And the cost to access that Wi-Fi varies. Sometimes widely. 

Southwest Airlines charges $8 a day for its Wi-Fi service, which prohibits access to Netflix and other high-bandwidth applications. Gogo, which provides inflight Wi-Fi to airlines such as United, Delta, Alaska and Air Canada, sells a variety of buy-before-you-fly passes. Order ahead and you’ll pay $7 for one hour of Wi-Fi access on domestic flights and $19 for 24 hours of Wi-Fi access on domestic flights.

Wait until you’re in the air to buy Wi-Fi access, though, and on most airlines the cost will be much higher.

How much higher? “Prices will vary,” is all several airlines will tell you. And it is rare, if ever, that purchasing an hour or a full day of Wi-Fi access is cheaper once you’re up in the air.  

But the tide on paid inflight Wi-Fi may be turning.

In 2016 JetBlue became the first domestic airline to offer its Fly-Fi streaming-quality Wi-Fi service free on all its planes.

Now Delta Air Lines is taking its first steps towards offering free Wi-Fi as well.

The Atlanta-based carrier started a two-week pilot test on May 13 that includes free Wi-Fi on around 55 domestic short, medium and long-haul flight segments a day.

“Customers are accustomed to having access to free Wi-Fi during nearly every other aspect of their journey, and Delta believes it should be free when flying, too,” said Ekrem Dimbiloglu, Delta’s Director of Onboard Product, in a statement, “Testing will be key to getting this highly complex program right – this takes a lot more creativity, investment and planning to bring to life than a simple flip of a switch.”

The test flight segments change daily; passengers learn if they’re on a free Wi-Fi flight from a pre-flight email or via a push notification from the Fly Delta app. Gate agents and flight attendants are also making announcements.

Only free ‘basic’ Wi-Fi is offered as part of the test, so passengers who need a more robust service for streaming will have to purchase the paid service. Right now it costs $16 for a North America Wi-Fi day-pass on Delta, if purchased pre-flight.

Is free in-flight Wi-Fi here to stay? And will other carriers follow?  

“It’s nice to see an airline offering a desired amenity on a complimentary basis,” said travel industry analyst and Atmosphere Research Group founder Henry Harteveldt, “But I’m uncertain whether Delta will be able to increase its market share, customer preference or revenue premium enough to warrant offering the free Wi-Fi.”  

Other industry experts expect Delta will continue down the full-time free Wi-Fi path, though, and that other airlines will have no choice but to follow.

“Delta tends to go first with these kinds of customer-friendly initiatives,” said Seth Kaplan, an aviation journalist and author of the book “Glory Lost and Found: How Delta Climbed from Despair to Dominance in the Post-9/11.” Kaplan said American Airlines and United Airlines sometimes match Delta rather than lose customers, even if they’re reluctant to do so. “But Delta’s move makes widespread free Wi-Fi much more likely than it seemed until recently,” said Kaplan.

Another reason passengers might soon enjoy widespread free inflight Wi-Fi: millennials.

“Millennials and younger generations expect free Wi-Fi access everywhere, especially when they are traveling,” said Kelly Soderlund, a travel trends expert with Hipmunk, “Much like hotels, which have been successful in leveraging consumer loyalty through free Wi-Fi, I would expect airlines to follow suit and meet that demand.”