If your simulator or VAS ACARS crashes, your flight data is not lost! Simply exit VAS ACARS without submitting your flight then you can restart your simulator and load your autosave. Wait until everything has been loaded then restart VAS ACARS and retrieve your booking. You will be prompted that you are not at your departure airport, press continue, and then you will be prompted that you can start a new recording or continue your previous one. Continue your previous one and you are good to go.