The first (and third) jet shown is the B-47 and was NOT capable of creating a sonic boom, but the second jet shown is the F-105 Thunderchief capable of Mach 2, more than enough to create sonic booms.
Per the title a black box is a technical term for a device or system or object when it is viewed primarily in terms of its input and output characteristics or the recorder installed on every commercial airliner use in the investigation of a crash.
This is the first reunion of Bea Benaderet and Fred Clark since they play married couple Blanche and Harry Morton on the Burns and Allen Show.