What is the difference between a Boeing Line number and a Block number? We know that every Boeing aircraft has a Line number, Block number, and MSN number. I want to know what what does it mean by this Line Number or Block number. and what are the difference among these terms.
Here is Boeing's Examples 

Block numbers 


ZA001 Onwards - B787-8
ZB001 Onwards - B787-9
ZC001 Onwards - B787-10
ZD001 Onwards - rebuild of prototypes
ZE001 Onwards - B787-9 with customizations


Line numbers are the serial number of the aircraft of that aircraft type

Serial Number is the manufacturers serial (basically the number of aircraft they have built up to that aircraft)

Airbus doesn't use the Boeing Line/Serial numbers, they use a different system where the aircraft serial number is in fact the aircraft line number and the total # of the aircraft being built.