GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents information about the Company's goodwill and other intangible assets at December 31 (in millions):
 
 
2018
 
2017
Item
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
Goodwill
 
$
4,523

 
 
 
$
4,523

 
 
 
 
 
 
 
 
 
 
 
Finite-lived intangible assets
 
 
 
 
 
 
 
 
Frequent flyer database
 
$
1,177

 
$
884

 
$
1,177

 
$
832

Hubs
 
145

 
97

 
145

 
89

Contracts
 
120

 
106

 
121

 
103

Patents and tradenames
 
108

 
108

 
108

 
108

Airport slots and gates
 
97

 
97

 
97

 
97

Other
 
109

 
88

 
109

 
84

Total
 
$
1,756

 
$
1,380

 
$
1,757

 
$
1,313

Indefinite-lived intangible assets
 
 
 
 
 
 
 
 
Route authorities
 
$
1,240

 
 
 
$
1,562

 
 
Airport slots and gates
 
546

 
 
 
536

 
 
Tradenames and logos
 
593

 
 
 
593

 
 
Alliances
 
404

 
 
 
404

 
 
Total
 
$
2,783

 
 
 
$
3,095

 
 

Amortization expense in 2018, 2017 and 2016 was $67 million, $79 million and $90 million, respectively. Projected amortization expense in 2019, 2020, 2021, 2022 and 2023 is $61 million, $55 million, $50 million, $40 million and $37 million, respectively.
See Note 14 of this report for additional information related to impairment of intangible assets.

Historical Timeline

Fiscal YearFiled
2018Feb 28, 2019Showing above
2017Feb 22, 2018
2016Feb 23, 2017
2015Feb 18, 2016

About Goodwill & Intangibles Disclosures

Goodwill and intangible asset disclosures reveal the premium paid in acquisitions and how management assesses whether that premium retains its value. Since goodwill is no longer amortized under US GAAP, the annual impairment test is the only mechanism that adjusts carrying values downward — making the assumptions behind that test critically important for investors.

Key signals: a history of goodwill impairments suggests management consistently overpays for acquisitions. Watch the gap between reporting unit fair value and carrying amount — when fair value exceeds carrying amount by less than 10-20%, a small decline in business performance could trigger a write-down. For finite-lived intangibles, examine useful life assumptions across customer relationships, technology, and trade names; aggressive estimates inflate near-term earnings. Compare total intangibles-to-total-assets ratios against peers to assess acquisition dependency. Rising goodwill as a percentage of equity can signal balance sheet fragility.