1 Leptin is a powerful and influential hormone produced by your fat cells. 2  It plays a key role in regulating energy intake and energy expenditure.
(Upgrades are not available on fares in the L, T, and U range, however, which are the most deeply discounted.) To calculate the price of an upgrade, Delta charges a dollar amount per 500 miles. $50: Up to 500 miles. $75: 501-1000 miles. $100: 1001-1500 miles.
American Express has increased the sign up bonus on the personal & business versions of the Delta Platinum card. Bonus is as follows: 70,000 miles & 10,000 MQM after $3,000 ($4,000 for business) in spend within the first four months; $100 statement credit after your first Delta purchase