UPDATE: Looks like the discount code is tapped. $10 per month is still a solid deal if you're going to be flying a bit and want Wi-Fi access.
Will you be flying in the next couple months? If so, check out US Mobile's $10 per month unlimited Wi-Fi plan. The Wi-Fi service will be provided by iPass which has teamed up with both Gogo and Panasonic.
You will have access to Wi-Fi on over 23 airlines around the world including American Airlines, Delta Air Lines, United Airlines, Alaska Airlines, Air France, KLM, Etihad, Lufthansa, Virgin Atlantic, Singapore Airlines, and more.
God Save The Points flagged a promo code (RPUSMWIFI) that will actually take this price down to $6 for a month. It's easy to sign-up and you can decide after your promo month if you'd like to continue for $10 per month.
When you consider that Gogo inflight internet costs $19 for a one-day pass on a single airline, $10 (or $6) for access to 23+ airlines is a fantastic deal.
Keep in mind, you can only link one device. If you want to link a second device, you'll need to buy another pass. Make sure you link the device you'll use most often.
h/t: View From The Wing