B, C, D, and E
Because of the convenience of air travel, plane tickets, especially for a great distance, are typically significantly more expensive than taking a road trip or railroad travel. That being said, certain budget airlines can make long air travel relatively inexpensive.
Air travel has slashed the amount of time for travel. For example, a flight from Boston to California is roughly 6 hours, while traveling by car would take about 24 hours.
Air travel has allowed nations to reach new areas for trade. Now, companies by sea or with local railroads are not the only ones involved in trade.
Air lining has created a vast number of jobs including, but not limited to, pilots, air traffic controllers, TSA, and baggage claim handlers.
Air travel has also expanded our travel options. Instead of trains, cars, and boat, now, there is an airline option.