On SkyVector, I see many airways with 'multiple' names such as J16-36 or even J89-94-100-128. I can't find any information on how to interpret these names.

I'm guessing it's a convention to say that for some portion of the airways, J89 and J94 overlap - but presumably it's still valid to simply route along J94 including those shared segments?

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Example near KORD


Yes, from your example J34-68-538 are jet routes that share a segment and aircraft on different routes may travel the same segments between waypoints. A complete explanation is in the FAA's Aeronautical Chart User Guide.

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  • 3
    $\begingroup$ In which section of the aero guide is the explanation please? I couldn't find it. $\endgroup$
    – ymb1
    Jul 20 '18 at 12:16

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