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Property and Equipment
 9 Months Ended
Sep. 30, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment, net, consists of the following:
 September 30, 2024December 31, 2023
Satellite system$1,598 $1,598 
Capitalized software and hardware2,180 2,178 
Construction in progress1,085 538 
Other
695 627 
Total property and equipment5,558 4,941 
Accumulated depreciation(3,545)(3,150)
Property and equipment, net$2,013 $1,791 
Construction in progress consists of the following:
 September 30, 2024December 31, 2023
Satellite system$706 $490 
Capitalized software and hardware339 17 
Other40 31 
Construction in progress$1,085 $538 
Depreciation and amortization expense on property and equipment was $113 and $96 for the three months ended September 30, 2024 and 2023, respectively, and $354 and $310 for the nine months ended September 30, 2024 and 2023, respectively. During the three and nine months ended September 30, 2024, we retired property and equipment of $3 and $58, respectively. There were no fixed asset impairment charges recorded during the nine months ended September 30, 2024. During the three and nine months ended September 30, 2023, we recorded fixed asset impairment charges of $1 and $14, respectively, primarily related to terminated software projects.
We capitalize a portion of the interest on funds borrowed to finance the construction and launch of our satellites. Capitalized interest is recorded as part of the asset’s cost and depreciated over the satellite’s useful life. Capitalized interest costs were $7 and $4 for the three months ended September 30, 2024 and 2023, respectively, and $19 and $10 for the nine months ended September 30, 2024 and 2023, respectively, which related to the construction of our SXM-9, SXM-10, SXM-11 and SXM-12 satellites. We also capitalize a portion of share-based compensation related to employee time for capitalized software projects. Capitalized share-based compensation costs were $7 and $6 for the three months ended September 30, 2024 and 2023, respectively, and $19 and $13 for the nine months ended September 30, 2024 and 2023, respectively.
Satellites
As of September 30, 2024, we operated a fleet of five satellites.  Each satellite requires an FCC license, and prior to the expiration of each license, we are required to apply for a renewal of the FCC satellite license.  The renewal and extension of our licenses is reasonably certain at minimal cost, which is expensed as incurred. The chart below provides certain information on our satellites as of September 30, 2024:
Satellite DescriptionYear DeliveredEstimated End of
Depreciable Life		FCC License Expiration Year
SIRIUS FM-5200920242025
SIRIUS FM-6201320282030
XM-3200520202026
XM-5201020252026
SXM-8202120362029
Our XM-3 satellite remains available as an in-orbit spare.