A method for requesting air traffic control clearance with a system comprising a communication unit coupled to at least one on-board avionics system, a display unit and a user input device, the method comprising: generating by the communication unit a system message to prompt for the user input to display the ATC clearance request page corresponding to the respective flight parameter, the system message including at least one initial computed value for the respective flight parameter, wherein generating a system message further comprises: receiving an advisory from the onboard avionics system regarding a proposed change to at least one respective flight parameter, said advisory containing a value for said at least one respective flight parameter; determining if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter; if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter, updating the existing unread system message with the value of the at least one respective flight parameter contained in the received advisory; and if an existing unread system message does not include a prompt to request a change to the at least one respective flight parameter, generating a new system message with the value of the at least one respective flight parameter contained in the received advisory; receiving at the communication unit user input from the user input device to display an ATC clearance request page corresponding to a respective flight parameter; based on the received user input, requesting by the communication unit at least one updated value be computed for the respective flight parameter from at least one onboard avionics system, wherein the at least one onboard avionics system comprises flight plan relevant sources of data; and displaying at the display unit the at least one computed value with the ATC clearance request page corresponding to the respective flight parameter. generating by the communication unit a system message to prompt for the user input to display the ATC clearance request page corresponding to the respective flight parameter, the system message including at least one initial computed value for the respective flight parameter, wherein generating a system message further comprises: receiving an advisory from the onboard avionics system regarding a proposed change to at least one respective flight parameter, said advisory containing a value for said at least one respective flight parameter; determining if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter; if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter, updating the existing unread system message with the value of the at least one respective flight parameter contained in the received advisory; and if an existing unread system message does not include a prompt to request a change to the at least one respective flight parameter, generating a new system message with the value of the at least one respective flight parameter contained in the received advisory; determining if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter; if an existing unread system message includes a prompt to request a change to the at least one respective flight parameter, updating the existing unread system message with the value of the at least one respective flight parameter contained in the received advisory; and if an existing unread system message does not include a prompt to request a change to the at least one respective flight parameter, generating a new system message with the value of the at least one respective flight parameter contained in the received advisory; receiving at the communication unit user input from the user input device to display an ATC clearance request page corresponding to a respective flight parameter; based on the received user input, requesting by the communication unit at least one updated value be computed for the respective flight parameter from at least one onboard avionics system, wherein the at least one onboard avionics system comprises flight plan relevant sources of data; and displaying at the display unit the at least one computed value with the ATC clearance request page corresponding to the respective flight parameter.