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Business Segments and Customer Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]  
Business Segments and Customer Information Business Segments and Customer Information
Segment Information

Management of our business operations is conducted under three reportable operating segments:

Aviation – Distribution and MRO Services
Our Aviation segment (formerly Aviation Group) provides aftermarket repair and distribution services to commercial, cargo, business and general aviation, military and defense, and rotorcraft customers globally. Core services include parts distribution, engine accessory maintenance, MRO services, rotable exchange and supply chain services.

Fleet – Distribution and Fleet Services
Our Fleet segment (formerly Supply Chain Management Group) provides parts, inventory management, e-commerce fulfillment, logistics, supply chain support and other services to support the commercial aftermarket medium- and heavy-duty truck market, the United States Postal Service ("USPS"), and the United States Department of Defense ("DoD"). Core services include vehicle parts distribution, sourcing, IT solutions customized fleet logistics, warehousing, kitting, just-in-time supply chain management, alternative product sourcing, and engineering and technical support.

Federal and Defense – Logistics and Sustainment Services
Our Federal and Defense segment (formerly Federal Services Group) provides aftermarket MRO and logistics services to improve operational readiness and extend the life cycle of military vehicles, ships and aircraft for the DoD, federal agencies and international defense customers. Core services include base operations support; procurement; supply chain management; vehicle, maritime and aircraft sustainment services; IT services and energy consulting.
The operating segments reported below are the segments of the Company for which separate financial information is available and for which segment results are evaluated regularly by our Chief Executive Officer in deciding how to allocate resources and in assessing performance. We evaluate segment performance based on consolidated revenues and operating income. Net sales of our business segments exclude inter-segment sales as these activities are eliminated in consolidation.
Our segment information is as follows (in thousands):
For the years ended December 31,
 202020192018
Revenues
Aviation $165,070 $224,546 $145,423 
Fleet242,170 214,520 214,809 
Federal and Defense254,419 313,561 336,986 
Total revenues$661,659 $752,627 $697,218 
Operating income (loss):   
Aviation$(35,513)$17,901 $11,076 
Fleet26,659 29,819 30,626 
Federal and Defense26,309 18,144 15,797 
Corporate expenses(3,532)(5,607)(3,269)
Operating income$13,923 $60,257 $54,230 
Depreciation and amortization expense:   
Aviation$10,874 $12,546 $5,123 
Fleet10,260 11,085 7,299 
Federal and Defense3,001 3,296 12,802 
Total depreciation and amortization$24,135 $26,927 $25,224 
Capital expenditures:   
Aviation$3,445 $8,396 $1,772 
Fleet675 1,076 802 
Federal and Defense148 58 209 
Corporate159 130 334 
Total capital expenditures$4,427 $9,660 $3,117 

 December 31,
 20202019
Total assets:
Aviation$478,861 $522,446 
Fleet161,088 170,142 
Federal and Defense66,808 88,966 
Corporate73,324 64,310 
Total assets$780,081 $845,864 

Revenues are net of inter-segment eliminations. Corporate expenses are primarily selling, general and administrative expenses not allocated to segments. Corporate assets are primarily cash, property and equipment and investments held in separate trust.

In 2020 and 2019, we allocated depreciation and amortization expense to each segment based on the segment in which each asset was utilized. In 2018, the allocation method for certain amortization expenses was based on each segment’s percentage of overall cost. The primary reason for the change is to allocate depreciation and amortization expense to a specific segment depending on the asset deployment. Depreciation and amortization expense by segment for 2018 was not recast for these allocation changes, and this change did not impact our previously reported consolidated financial results. The impact for 2018, under the new allocation method, would have been a decrease in depreciation and amortization expense for the Federal and Defense segment of $8.1 million, with a corresponding increase for Aviation segment and Fleet segment of $3.7 million and $4.4 million, respectively.
Customer Information

Our revenues are derived from contract services performed for DoD agencies or federal civilian agencies and from the delivery of products to our commercial clients. The USPS, U.S. Army and Army Reserve, and U.S. Navy are our largest customers. Our customers also include various other government agencies and commercial entities. Our revenue by customer is as follows for the years ended December 31, (in thousands):
Years ended December 31,
Source of Revenues2020%2019%2018%
DoD$236,397 36 $304,334 41 $334,494 48 
Other government216,957 33 205,775 27 212,118 30 
Commercial208,305 31 242,518 32 150,606 22 
Total Revenues$661,659 100 $752,627 100 $697,218 100 

We do not measure revenue or profit by product or service lines, either for internal management or external financial reporting purposes, because it would be impractical to do so. Products offered and services performed are determined by contract requirements and the types of products and services provided for one contract bear no relation to similar products and services provided on another contract. Products and services provided vary when new contracts begin or current contracts expire. In many cases, more than one product or service is provided under a contract or contract task order. Accordingly, cost and revenue tracking are designed to best serve contract requirements and segregating costs and revenues by product or service lines in situations for which it is not required would be difficult and costly to both us and our customers.

Geographical Information

Revenue by geography is based on the billing address of the customer. Our revenue by geographic area is as follows (in thousands):
 Years ended December 31,
 202020192018
United States$598,142 $659,451 $647,168 
Other Countries (1)
63,517 93,176 50,050 
Total revenue$661,659 $752,627 $697,218 
(1) No individual country, other than disclosed above, exceeded 10% of our total revenue for any period presented.