There are many different airlines in many different countries; some which fly internationally and there are those that do not. As far as here in the United States, there are an abundance of US airlines that fly all around the various parts of the world as well as most all points domestically.
For us here in the United States the major US airlines are all well known. Names like American, Delta, Northwest, TWA, Continental, etc are well know both here in the U.S. and abroad. And since these US airlines cover the bases of most travel plans both here and abroad you should have no trouble finding a US airline that can accomodate just about any travel plans whether they be locally (domestic) or foreign.
As you would expect with US airlines the domestic flights will be much cheaper that those that are intercontinental. So, it only stands to reason that a flight to Venice Italy is going to be more pricey than a flight to Venice, California. Most all of the US airlines will have similar pricing structures… but not the same so you’ll want to peruse each of those that seem to fit your travel plans carefully.
If you become confused by all the options or...