flynn received a complete pardo, he is exonerated
he was never sentenced
https://www.justice.gov/pardon/pardon-information-and-instructions
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10. Effect of a pardon
While a presidential pardon will restore various rights lost as a result of the pardoned offense and should lessen to some extent the stigma arising from a conviction, it will not erase or expunge the record of your conviction. Therefore, even if you are granted a pardon, you must still disclose your conviction on any form where such information is required, although you may also disclose the fact that you received a pardon. In addition, most civil disabilities attendant upon a federal felony conviction, such as loss of the right to vote and hold state public office, are imposed by state rather than federal law, and also may be removed by state action. Because the federal pardon process is exacting and may be more time-consuming than analogous state procedures, you may wish to consult with the appropriate authorities in the state of your residence regarding the procedures for restoring your state civil rights.