As broadband Internet service becomes increasingly widespread and free in public places, it has remained, to travelers’ annoyance, stuck in the slow lane on airplanes.

But with recent developments in technology, sluggish in-flight Internet speed is starting, however fitfully, to change. Still, it might not catch up to passengers’ expectations, as many are accustomed to a superior Internet experience on the ground.

“Connectivity is indeed getting better on flights, but it’s a very slow process, which is frustrating to business travelers who increasingly rely on the service,” said Chris McGinnis, founder of TravelSkills, a blog that focuses on the business passenger, and an inveterate user of Wi-Fi while airborne.

“The thing that they must realize is that in-flight Wi-Fi is still a very new product, and the expectation that you’ll get a good, strong signal like you do at home or office needs to be reined in,” Mr. McGinnis added. “Airlines are partially to blame for inflating expectations.”