The nearest major airport is Indianapolis International Airport (IND / KIND). This airport has international and domestic flights from Indianapolis, Indiana and is 71 miles from the center of Purdue University.
Here is the official FDA definition of natural flavoring: Natural flavor is the essential oil, oleoresin, essence or extractive, protein hydrolysate, distillate, or any product of roasting, heating or enzymolysis, which contains the flavoring constituents derived from a spice, fruit or fruit juice, vegetable or vegetable juice, edible yeast, herb, bark, bud, root, leaf or similar plant material, meat, seafood, poultry, eggs, dairy products, or fermentation products thereof, whose ...
Citric acid and natural flavors are ingredients of Yoplait yogurt, which add flavor to the yogurt. Citric acid is a weak acid commonly used as a food additive to give food a tangy flavor. Natural flavors may come from a natural source or may be chemically derived.