Rank the following compounds in order of acidity. 
Definitions:
Passengers
Individuals who are being transported from one place to another in a vehicle, aircraft, or vessel, usually for a fare.
Plane Operating Costs
Expenses associated with operating an aircraft, which include fuel, maintenance, crew salaries, and landing fees among others.
Tenant-Days
A metric that represents the total number of days that all units in a property were occupied over a specific period.
Revenue Variance
The difference between actual revenue and budgeted or expected revenue.
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