From FlyerGuide Wiki

Ascent Level: For members who fly 15,000 actual flight miles on Frontier Airlines during a calendar year. Benefits include:

• 10% flight mileage bonus.
• Priority check-in and boarding.
• Exclusive Ascent customer service toll-free number.
• Special Frontier and partner program offers.
• Use Frequent Flyer Elite lines at the security checkpoints at Denver International Airport.

Summit Level: For members who fly 25,000 actual flight miles on on Frontier Airlines during a calendar year. Benefits include the above listed, plus:

• 25% flight mileage bonus.
• Standby fee waived on return flights.
• Complimentary on-board beverages.
• Extra allowance on checked baggage.
• Priority baggage handling.
• Guaranteed full-fare reservations on Frontier with 72 hours notice.
• Exclusive Summit customer service toll-free number.