sneak on

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Senior Member
Korea, Korean
Meanwhile, in the main cabin, Jane Marshall, 50, walks down the aisle, checking to make sure people are finding their correct seats, keeping an eye out for passengers who have sneaked on luggage that she knows won’t fit in the overhead space and trying to defuse any tense situations before they escalate into crises. (source)

What does "sneak on luggage" mean?
I'd like to know what the underlined part means.
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