NOTE F — INTANGIBLE ASSETS

In accordance with ASC 350, Intangibles — Goodwill and Other, goodwill and other intangible assets deemed to have indefinite lives are not amortized, but are subject to annual impairment tests. We review and evaluate our goodwill and indefinite life intangible assets for potential impairment at a minimum annually or more frequently if circumstances indicate that impairment is possible.

We determined the fair value of assets acquired and liabilities assumed using a variety of methods. An income approach based on discounted cash flows was used to determine the values of our trademarks, certifications, customer relationships and FAA certificates. The assumptions we used to estimate the fair value of our reporting units are based on historical performance, as well as forecasts used in our current business plan and require considerable management judgment

The Company’s goodwill and intangible assets as defined by ASC 350 is related to our subsidiaries, AerSale Component Solutions (d/b/a AerSale Landing Gear Solutions) (“ALGS”), Avborne Component Solutions (d/b/a AerSale Component Solutions) (“ACS”), and the most recently acquired Aircraft Composite Technologies (“ACT”), which are included in the TechOps segment, as well as Qwest, which is included under the Asset Management Solutions segment.

Goodwill and other intangibles as of March 31, 2021 and December 31, 2020 are (in thousands):

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As a result of the COVID-19 pandemic and its impact on the aviation industry, the Company performed a qualitative impairment analysis as of March 31, 2020 on the indefinite lived intangible assets and concluded there was no impairment. Additionally, the Company performed an impairment analysis on the goodwill for both the Asset Management Solutions and TechOps segment and concluded that goodwill was not impaired as of March 31, 2020.

Intangible assets with definite useful lives are amortized on a straight-line basis over their estimated useful lives. Intangible assets with definite lives as of March 31, 2021 and December 31, 2020 are as follows (in thousands):

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Total amortization expense amounted to $0.5 million and $0.3 million for the three months ended March 31, 2021 and 2020, respectively. Accumulated amortization amounted to $3.5 million and $3.0 million as of March 31, 2021 and December 31, 2020, respectively.

Other intangible assets are reviewed at least annually or more frequently if any event or change in circumstance indicates that an impairment may have occurred. As a result of the COVID-19 pandemic and its impact on the aviation industry, the Company performed an impairment analysis as of March 31, 2020 on the definite-lived intangible assets and concluded there was no impairment.

There was no goodwill activity for the three months ended March 31, 2021. For the three-month period ended March 31, 2020, goodwill increased by $6.0 million.