By breathing among people. Bubonic plague not spread that way. Black Death seems to have often been contagious person to person
If interested, search 'Theories of Black Death' and you'll see why the 'Bubonic Plague alone' one doesn't seem to hold water.
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eg http://www.nature.com/scitable/blog/viruses101/could_the_black_death_actually … But claims this explains whole thing no good either coz buboes & Y.Pestis found in remains of victims.
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Its a mystery likely to be solved in our lifetime coz medievalists are on it in combination with medical scientists.
End of conversation
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