[Answer] Which airline introduced online check-in?

Step 1 : Introduction to the question "Which airline introduced online check-in?"

...1. United Airlines 2. Alaska Airlines 3. American Airlines 4. Delta Air Lines

Step 2 : Answer to the question "Which airline introduced online check-in?"

Alaska Airlines - Who doesn’t want to save time at the airport? That’s one of the main reasons why online check-in for flights has become so popular since it was introduced right before the turn of the century. The first person to receive their boarding pass on the Internet instead of the traditional airline check-in counter was traveling on an Alaska Airlines flight from San Jose, California, to Seattle in 1999. This wasn’t the first innovation for the Seattle-based carrier — four years prior to that, Alaska Airlines was the first to sell tickets on the internet in 1995. Other airlines quickly followed suit, and now it’s difficult to remember a time where you couldn’t check in for flights or even book tickets online. :

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