For North American airlines, JetBlue leads the pack with an average wait under five minutes. Not far behind are Virgin America, Alaska Air, and Southwest, all of which reply to senders well within 10 minutes. From there, the waits crest upwards of half an hour, until United Airlines enters the equation with a laggard response time of 1 hour and 34 minutes.
Airlines based in Europe and the Middle East are slower. If dealing with one of these carriers, you're likely to wait 1 hour and 41 minutes, as Emirates, Easy Jet and Finnair take the equivalent of an eternity to field service requests. Interestingly, and in no service to their customer service reputations, these airlines are subjected to far fewer Twitter complaints than their North American counterparts.
The data was collected from tweets sent to the respective airlines between October 5 to October 8 of 2017, so maybe consider the study as more of snapshot of the airlines' social media service than a definitive ranking. And maybe extend a little sympathy to the inundated social media teams fielding these requests with aplomb. After all, they're basically the air traffic controllers of the internet.