OFFICE LEASE LEASE TERM SHEET BUILDING: Airport Plaza LEASE DATE: August 1st, 1998 LANDLORD: Pacific Rim Investments, a Colorado Limited Liability Partnership Address: 12015 E. 46th Ave. Suite #115 Denver, Colorado 80239 TENANT: Name: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 (Address for Notice if different than above) BROKER OF RECORD: na TENANT'S BROKER(if any) na LEASED PREMISES: Suite Number: 120 Floor: 1st floor Address: 12015 E. 46th Avenue-Denver, Colorado 80239 Tenant's Rentable Area: 2,107 RSF (rentable square feet) Taken in as is/where is condition. LEASE TERM: Lease Commencement Date: August 1st, 1998 Lease Expiration Date: August 31, 1999 Lease Period: 1 year(s), plus 1 month(s) with 1 option for tenant to renew for a period of six to twelve months at tenants election and at current rental rate. An annual rental rate of $27,391.00 divided into 12 (twelve) equal monthly installments of $2,282.50 per month, due and payable on the first day of each month. This term sheet is part of the 2nd floor lease dated March 15th, 1994. "BUILDING OPERATING COST" REFERENCE (Article 5.02): BASE YEAR: Calendar Year 1994 TENANT'S PRO RATA SHARE(of Building for Building Operating Costs): 2,107/63,226 SECURITY DEPOSIT: (Equivalent to first months rent) PERMITTED USE: General Office PARKING: Number of parking Spaces: N/A Location of Parking Spaces: Adjacent to office building PACIFIC RIM INVESTMENTS FRONTIER AIRLINES LANDLORD TENANT OFFICE LEASE LEASE TERM SHEET BUILDING: Airport Plaza LEASE DATE: August 1st, 1998 LANDLORD: Pacific Rim Investments, a Colorado Limited Liability Partnership Address: 12015 E. 46th Ave. Suite #115 Denver, Colorado 80239 TENANT: Name: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 (Address for Notice if different than above) BROKER OF RECORD: na TENANT'S BROKER(if any) na LEASED PREMISES: Suite Number: 400 Floor: 4th floor Address: 12015 E. 46th Avenue-Denver, Colorado 80239 Tenant's Rentable Area: 1,422 RSF (rentable square feet) Taken in as is/where is condition except for painting and patching of walls, carpet cleaned. LEASE TERM: Lease Commencement Date: August 1st, 1998 Lease Expiration Date: August 31, 1999 Lease Period: 1 year(s), plus 1 month(s) with 1 option for tenant to renew for a period of six to twelve months at tenants election and at current rental rate. An annual rental rate of $18,486.00 divided into 12 (twelve) equal monthly installments of $1,540.50 per month, due and payable on the first day of each month. This term sheet is part of the 2nd floor lease dated March 15th, 1994. "BUILDING OPERATING COST" REFERENCE (Article 5.02): BASE YEAR: Calendar Year 1994 TENANT'S PRO RATA SHARE(of Building for Building Operating Costs): 1,422/63,226 SECURITY DEPOSIT: (Equivalent to first months rent) PERMITTED USE: General Office PARKING: Number of parking Spaces: N/A Location of Parking Spaces: Adjacent to office building PACIFIC RIM INVESTMENTS FRONTIER AIRLINES LANDLORD TENANT OFFICE LEASE LEASE TERM SHEET BUILDING: Airport Plaza LEASE DATE: Sept. 14, 1998 LANDLORD: Pacific Rim Investments, a Colorado Limited Liability Partnership Address: 12015 E. 46th Ave. Suite #115 Denver, Colorado 80239 TENANT: Name: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 (Address for Notice if different than above) BROKER OF RECORD: na TENANT'S BROKER(if any) na LEASED PREMISES: Suite Number: 360 Floor: 3rd floor Address: 12015 E. 46th Avenue-Denver, Colorado 80239 Tenant's Rentable Area: 1,140 RSF (rentable square feet) LEASE TERM: Lease Commencement Date: September 15, 1998 Lease Expiration Date: August 31, 1999 Lease Period: 0 year(s), plus 11.5 month(s) with 1 option for tenant to renew for a period of six to twelve months at tenants election and at current rental rate. An annual rental rate of $14,820(less 2 weeks of Sept.) divided into 12 (twelve) equal monthly installments of $1,235 per month, due and payable on the first day of each month. "BUILDING OPERATING COST" REFERENCE (Article 5): BASE YEAR: Calendar Year 1994 or EXPENSE STOP: Reference 1994 lease TENANT'S PRO RATA SHARE(of Building for Building Operating Costs): 1,140/63,226 SECURITY DEPOSIT: (Equivalent to first months rent) PERMITTED USE: General Office PARKING: Number of parking Spaces: N/A Location of Parking Spaces: Adjacent to office building PACIFIC RIM INVESTMENTS FRONTIER AIRLINES LANDLORD TENANT OFFICE LEASE LEASE TERM SHEET BUILDING: Airport Plaza LEASE DATE: January 1st, 1999 LANDLORD: Pacific Rim Investments, a Colorado Limited Liability Partnership Address: 12015 E. 46th Ave. Suite #115 Denver, Colorado 80239 TENANT: Name: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 (Address for Notice if different than above) BROKER OF RECORD: na TENANT'S BROKER(if any) na LEASED PREMISES: Suite Number: 121 Floor: 1st floor Square Footage: 1,600 Suite Number: 190 Floor: 1st floor Square Footage: 700 Suite Number: 300 Floor: 3rd floor Square Footage: 3,031 Address: 12015 E. 46th Avenue-Denver, Colorado 80239 Tenant's Rentable Area: 5,331 RSF (rentable square feet) Taken in as is/where is condition except for painting, light fixtures, locks, as required. LEASE TERM: Lease Commencement Date: January 1st, 1999 Lease Expiration Date: January 31st, 2001 Lease Period: 2 year(s), plus 1 month(s) with 1 option for tenant to renew for a period of six to twelve months at tenants election and at current rental rate. An annual rental rate of $63,972.00 divided into 12 (twelve) equal monthly installments of $5,331.00 per month, due and payable on the first day of each month. This term sheet is part of the 2nd floor lease dated March 15th, 1994. "BUILDING OPERATING COST" REFERENCE (Article 5.02): BASE YEAR: Calendar Year 1999 TENANT'S PRO RATA SHARE(of Building for Building Operating Costs): 5,331/63,226 SECURITY DEPOSIT: (Equivalent to first months rent) PERMITTED USE: General Office PARKING: Number of parking Spaces: N/A Location of Parking Spaces: Adjacent to office building PACIFIC RIM INVESTMENTS FRONTIER AIRLINES LANDLORD TENANT OFFICE LEASE LEASE TERM SHEET BUILDING: Airport Plaza LEASE DATE: January 20th, 1999 LANDLORD: Pacific Rim Investments, a Colorado Limited Liability Partnership Address: 12015 E. 46th Ave. Suite #115 Denver, Colorado 80239 TENANT: Name: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 (Address for Notice if different than above) BROKER OF RECORD: na TENANT'S BROKER(if any) na LEASED PREMISES: Suite Number: 450 Floor: 4th floor Square Footage: 846 Address: 12015 E. 46th Avenue-Denver, Colorado 80239 Tenant's Rentable Area: 846 RSF (rentable square feet) Taken in as is/where is condition as of 1/15/99 with no additional improvements. LEASE TERM: Lease Commencement Date: January 20th, 1999 Lease Expiration Date: January 31st, 2001 Lease Period: 2 year(s), plus 11 day(s) with 1 option for tenant to renew for a period of six to twelve months at tenants election and at current rental rate. An annual rental rate of $11,844.00 divided into 12 (twelve) equal monthly installments of $987.00 per month, due and payable on the first day of each month. This term sheet is part of, and shall be incorporated into and shall be an addendum to the 2nd floor lease dated March 15th, 1994. "BUILDING OPERATING COST" REFERENCE (Article 5.02): BASE YEAR: Calendar Year 1999 (Paragraph 6B(2), or EXPENSE STOP: $5.00 per square foot.[Paragraph 6B(3)] TENANT'S PRO RATA SHARE(of Building for Building Operating Costs): 846/63,226 SECURITY DEPOSIT: (Equivalent to first months rent) PERMITTED USE: General Office PARKING: Number of parking Spaces: N/A Location of Parking Spaces: Adjacent to office building PACIFIC RIM INVESTMENTS FRONTIER AIRLINES LANDLORD TENANT OFFICE LEASE LEASE TERM SHEET This Office Lease Term Sheet is part of, shall be incorporated into and shall constitute an addendum to the Lease Agreement, dated March 15, 1994, between Tenant and the predecessor owner of the building (the "Lease"). Building: Airport Plaza 12015 East 46th Avenue Denver, CO 80239 Term Sheet Date: May 16, 1999 Landlord: Highline Group, LLC, as reciever for 12015 East 46th Avenue, Denver, CO 80239 Address: 1425 Market Street, Suite 205 Denver, Colorado 80202 Tenant: Frontier Airlines Address: 12015 E. 46th Avenue, Suite 200 Denver, Colorado 80239 Broker of Record: n/a Tenant's Broker: n/a Leased Premises: Suite: 470 Floor: 4th Square Footage: 2,762 Lease Term: Commencement: May 17, 1999 Termination: January 31, 2001 Rental Rate: $3,222.33 per month during the term of this Amendment. Tenant Finish: None Building Operating Cost Reference (Article 5.02 of Lease): Base Year: Calendar Year 1999 Expense Stop: $5.00 per square foot Tenant's Pro Rata Share applicable to this Amendment: 2,762/63,226 Security Deposit applicable to this Amendment: none Permitted Use: General Office Parking: Number of parking spaces-n/a Location of Parking Spaces: Adjacent to building Highline Group LLC, Frontier Airlines, Inc. As receiver for 12015 East 46th Avenue