A method for generating a request onboard an aircraft, by a processor communicatively coupled to system memory and a communication device, is provided. In response to a requested change to a current flight plan, the method automatically generates, by the processor, a text-based clearance request for the requested change, the text-based clearance request comprising aircraft identification and the requested change, and the requested change comprising at least one of a new cruising level, a new cruising speed at the new cruising level, flight rules, a new route description, and revised time estimates associated with waypoints of the current flight plan; and transmits the text-based clearance request, via the communication device.