Upvote:3
Depending on the physical location, you may simply be exhausting the network's capacity to onboard a new client. This are some technical details that I won't bore you with but the bottom line is:
Move to a different location.
Some food establishments at airports offer their own wifi - you may have to buy a drink or so, but its a great option if you are desperate to get online.
Pay for the premium wifi - every airport I have been to offers this option.
Use the wired internet option if offered. This is usually available at the lounge areas, but you'll find it is easier to connect since almost no one is using it. Great if you need to work on a laptop.
If you are technically savvy:
By the way, many people would kill for 3+ Mbps.