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They are two different things that aren't related, hence the different sizes.
Bytes in flight is the number of bytes transmitted since the last ACK received.
Bytes since the last PSH flag is the number of transmitted since the last segment with the PSH flag set was transmitted. Some info on how the PSH flag is handled by both sender and receiver can be found here.
They are two tow different things that aren't related, hence the different sizes.
Bytes in flight is the number of bytes transmitted since the last ACK received.
Bytes since the last PSH flag is the number of transmitted since the last segment with the PSH flag set was transmitted. Some info on how the PSH flag is handled by both sender and receiver can be found here.