The following is a list of five of the world's busiest airports by passenger traffic for Year 1. 
How many more millions of passengers flew out of Atlanta than flew out of Chicago?
Definitions:
Unknown Compound
A substance whose chemical identity is not yet determined or disclosed, often a focus in analytical and synthetic chemistry research.
Proton Decoupled
A technique in NMR spectroscopy where the coupling between nuclear spins is removed, often leading to simpler spectra.
Compounds
Substances formed from two or more elements chemically bonded together in fixed proportions.
Distinction
A differentiation between two or more substances or concepts based on their characteristics or properties.
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