<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-08-10</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001362988</issuerCik>
        <issuerName>Aircastle LTD</issuerName>
        <issuerTradingSymbol>AYR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001124460</rptOwnerCik>
            <rptOwnerName>EDENS WESLEY R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FORTRESS INVESTMENT GROUP LLC</rptOwnerStreet1>
            <rptOwnerStreet2>1345 AVENUE OF THE AMERICAS, 46TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Shares</value>
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            <transactionTimeliness>
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                    <footnoteId id="F3"/>
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                    <footnoteId id="F3"/>
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    <footnotes>
        <footnote id="F1">Fortress Fund III GP LLC (&quot;FF III GP LLC&quot;) is the general partner, and FIG LLC is the investment advisor, of each of Fortress Investment Fund III LP (&quot;FIF III LP&quot;), Fortress Investment Fund III (Fund B) LP (&quot;FIF III Fund B LP&quot;), Fortress Investment Fund III (Fund C) LP (&quot;FIF III Fund C LP&quot;), Fortress Investment Fund III (Fund D) L.P. (&quot;FIF III Fund D L.P.&quot;), Fortress Investment Fund III (Fund E) L.P. (&quot;FIF III Fund E L.P.&quot;), Fortress Investment Fund III (Coinvestment Fund A) LP (&quot;FIF III Coinvest Fund A LP&quot;), Fortress Investment Fund III (Coinvestment Fund B) LP (&quot;FIF III Coinvest Fund B LP&quot;), Fortress Investment Fund III (Coinvestment Fund C) LP (&quot;FIF III Coinvest Fund C LP&quot;), and Fortress Investment Fund III (Coinvestment Fund D) L.P. (&quot;FIF III Coinvest Fund D L.P.&quot;).</footnote>
        <footnote id="F2">(continued from previous footnote) FIF III LP is the sole member each of Fortress Investment Fund III Sub LLC and Fortress Investment Fund III Sub Two LLC. FIF III Fund B LP is the sole member of each of Fortress Investment Fund III (Fund B) Sub LLC and Fortress Investment Fund III (Fund B) Sub Two LLC. FIF III Fund C LP is the sole member of Fortress Investment Fund III (Fund C) Sub LLC. FIF III Fund D L.P. is the sole member of Fortress Investment Fund III (Fund D) Sub Ltd. FIF III Fund E L.P. is the sole member of Fortress Investment Fund III (Fund E) Sub Ltd. FIF III Coinvest Fund A LP is the sole member of Fortress Investment Fund III (Coinvestment Fund A) Sub LLC.</footnote>
        <footnote id="F3">(continued from previous footnote) FIF III Coinvest Fund B LP is the sole member of Fortress Investment Fund III (Coinvestment Fund B) Sub LLC. FIF III Coinvest Fund C LP is the sole member of Fortress Investment Fund III (Coinvestment Fund C ) Sub LLC and FIF III Coinvest Fund D L.P. is the sole member of Fortress Investment Fund III (Coinvestment Fund D) Sub Ltd.  The sole managing member of FF III GP LLC is Fortress Investment Fund GP (Holdings) LLC. The sole managing member of Fortress Investment Fund GP (Holdings) LLC is Fortress Operating Entity I LP (&quot;FOE I&quot;). FOE I is the sole managing member of FIG LLC. FIG Corp. is the general partner of FOE I.  FIG Corp. is wholly-owned by Fortress Investment Group LLC.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Wesley R. Edens</signatureName>
        <signatureDate>2012-08-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
