You can copy airdrop from Washington for example and then modify it. Simply paste it in the Airdrops.MAP.xml where MAP is your map name and if you want modify it. Then use rocket reload AirdropManager3 in console to reload it.
<?xml version="1.0" encoding="utf-8"?>
<AirdropsConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Airdrops>
<Airdrop Id="541" Name="Washington_Carepackage_America">
<Items>
<Item Id="123" Name="Ranger Magazine" Weight="150" />
<Item Id="1449" Name="Scalar Magazine" Weight="100" />
<Item Id="1368" Name="Vonya Magazine" Weight="100" />
<Item Id="1366" Name="Vonya" Weight="100" />
<Item Id="1360" Name="Teklowvka" Weight="100" />
<Item Id="1481" Name="Empire" Weight="100" />
<Item Id="1241" Name="Demolition Charge" Weight="100" />
<Item Id="1381" Name="Calling Card Magazine" Weight="100" />
<Item Id="1369" Name="Bulldog" Weight="100" />
<Item Id="1447" Name="Scalar" Weight="100" />
<Item Id="1361" Name="Teklowvka Magazine" Weight="100" />
<Item Id="1371" Name="Bulldog Magazine" Weight="100" />
<Item Id="1379" Name="Calling Card" Weight="100" />
<Item Id="1483" Name="Empire Magazine" Weight="100" />
<Item Id="1375" Name="Fusilaut" Weight="50" />
<Item Id="1484" Name="Devil's Bane" Weight="50" />
<Item Id="1488" Name="Swissgewehr" Weight="50" />
<Item Id="1362" Name="Augewehr" Weight="50" />
<Item Id="1490" Name="Swissgewehr Magazine" Weight="50" />
<Item Id="6" Name="Military Magazine" Weight="50" />
<Item Id="363" Name="Maplestrike" Weight="50" />
<Item Id="1485" Name="Devil's Bane Magazine" Weight="50" />
<Item Id="1377" Name="Nightraider" Weight="50" />
<Item Id="1240" Name="Detonator" Weight="40" />
<Item Id="1384" Name="Ekho Magazine" Weight="25" />
<Item Id="1382" Name="Ekho" Weight="25" />
<Item Id="20" Name="Timberwolf Magazine" Weight="25" />
<Item Id="18" Name="Timberwolf" Weight="25" />
<Item Id="1364" Name="Hell's Fury" Weight="10" />
<Item Id="1365" Name="Hell's Fury Drum" Weight="10" />
</Items>
</Airdrop>
</Airdrops>
</AirdropsConfiguration>
