Yes, that will work fine. It's the best way to use it to be honest.
As long as you connect to WiFi or tether to your phone before you leave on your trip, SD will be up to date with all the information you need for your flight.
3G connections whilst airborne are flakey and unpredictable so it's not a good idea to rely on them. It's best to leave the default communication options set which means that SD won't try and connect when in flight.