1. A system for providing a dynamic, time-based data delivery service to airline passenger subscribers during flight, comprising: one or more computing devices communicatively coupled to one or more communication networks, the one or more communication networks configured to communicatively interconnect an aircraft and a ground network; and one or more non-transitory computer-readable memories accessible to the one or more computing devices and storing thereon instructions that, when executed by one or more processors, cause the system to: detect an occurrence of a network degradation event, wherein the network degradation event occurs during a flight of the aircraft when at least a portion of the one or more communication networks has a decreased network connectivity and/or has a response speed that exceeds a degradation threshold; determine, in response to the detection of the occurrence of the network degradation event, a modification to a data delivery service plan of a subscriber for accessing data via the one or more communication networks during the flight; and modify the data delivery service plan of the subscriber to include the modification.