Aircell is eliminating unlimited service plans for new activations using its Gogo Biz air-to-ground network, beginning July 16. After this date, existing unlimited service contracts will be subject to a “grandfathering” option, which continues unlimited service until Dec. 15, 2016. Aircell says it was prompted to make the change by the rapid growth in data usage aloft, which mirrors ground-bound mobile device users’ appetite for data. Rate plans are also changing, but customers will get more data for the same price under the new lowest-cost plan.