Message posted by Smythers on March 18, 2021 at 9:30:40 PST:

Just in case you hear a peel of thunder or think you are hearing distant artillery on a clear sunny morning.

In Reply to: D-SEND S3CM JAXA Low Sonic Boom Research model posted by Smythers on March 18, 2021 at 8:36:40 PST:

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