Answer: escalators

AnswerCrossword Clue
ESCALATORS

One-way flights?

ESCALATORS

They take shoppers to new levels

ESCALATORS

They take people to new levels

ESCALATORS
Stairways of a sort.
ESCALATORS
Subway transport.
ESCALATORSShoppers' transit
ESCALATORSSome clauses
ESCALATORSThey may lead to another story
ESCALATORSNonstop flights?