Found this info; may be helpful:
Resupplies "Damaged field and city objects can be rebuilt with the successful delivery of supplies. Conceptually, the objects are being resupplied but visually they are being rebuilt. This is done by reducing the downtime by 30 minutes depending on how much of the supplies reach the destination. If only half of the supplies reach the destination, the downtime is decreased by 15 minutes."
Trains, convoys, and barges "Trains, convoys, and barges are built into the terrain. Each train, convoy, or barge has a source point and a destination point, and each can be damaged or destroyed while traveling from point to point. When a train, convoy, or barge is destroyed, they will automatically respawn every ten minutes.
Each time a train, convoy or barge spawns, it first checks to see if there has been damage to the supplier (cities supply factories and factories supply fields). The amount of supplies carried to the destination depends on the amount of damage to the supplier. If the supplier has been damaged by 50%, only one out of every six train cars or convoy trucks will carry supplies.
The destination point is where the train, convoy, or barge attempts to resupply. The destination can be either a single field, or a number of objects within a defined radius. If a destination field is captured while a train, convoy, or barge is enroute, the train, convoy, or barge continues to the destination, and resupplies from the factories of the capturing country.
Once a train, convoy, or barge has successfully reached it's destination, a new supply convoy spawns."
Supply Drops"The C-47, LVT-2, and M-3 have the capability to drop supplies on a field to repair the field or shorten the downtime. These object supplies will repair all resupplyable objects in a one mile radius from the point where the supplies land. The supplies are selected as a loadout option in the hangar, and .25 perk points are awarded to the player who dropped the supplies for every object that's affected by the resupply.
A vehicle supply type is also available to repair and supply vehicles with ordnance. When these supplies are dropped, any friendly vehicle within a half mile radius receives a Load Supplies button on their screen. Clicking this button will use the supplies to both repair and rearm their vehicle. If the supplies are unused, they vanish after 15 minutes. Vehicle supplies will not reload troops or the vehicle and object supplies."
Stategic System"The basic categories of strategy targets in Aces High include field targets, zone targets, city targets, and supply targets.
The field targets affect availability of field items such as planes, fuel, ammo, etc. Every tower has a chalkboard displaying the field number and the current status of the field targets.
The zone targets are the factories that affect the resupply of field targets.
The city targets are the buildings within a city and they affect the resupply of the zone targets.
The supply targets are the trains, convoys, and barges that resupply damaged fields and factories. "
Strategic Targets
*Each drop of convoy or train supplies on damaged city targets reduces the 3 hour downtime by 30 minutes. Each drop of player supplies reduces the downtime by 15 minutes.
Checking Status of Field "In Aces High II, the status of any field may be checked by right-clicking on the clipboard map and selecting Field Status from the menu. The clipboard's swing out page will show the status of the field nearest your click point. While the swing out page is showing, you may check the status of any field by highlighting that field in the list."
Fuel Availability at the Field"The percentage of fuel available at a field is determined by whether a fuel object at the field has been hit, and the rebuild time depends on whether there is a resupply from the zone's refinery. The amount of supplies shipped via convoy from the refinery depends on if there is damage to the refinery."
Ordnance Availability at the Field"Ordnance available for aircraft, vehicles and/or boats at the field is displayed as part of the field status. The rebuild time of damaged or destroyed ordnance objects is determined by whether a resupply occurs from an ammunition factory of that zone. The amount of supplies shipped via convoy from the factory depends on if there is damage to the factory."
Radar Availability at the Field"The rebuild time of damaged or destroyed radar is determined by whether a resupply from the radar factory arrives at the field. The amount of supplies a radar factory for that country has been damaged or destroyed. The amount of supplies shipped via convoy from the factory depends on if there is damage to the radar factory."
Troop Availability at the Field"Troops must be available for loading on troop transports such as the C-47, M-3 and LVT-2. The rebuild time of damaged bunker objects is determined by whether a resupply of personnel from the training barracks of that country has arrived at the field."
Model Availability at the Field"Fighters, bombers, vehicles and boats must be available for use at a field. Airplanes, vehicles and boats become unavailable when their hangars are destroyed."
City Damage Status"The city damage status indicates the percentage of objects destroyed in a city complex, which then affects the resupply of personnel to the factories via trains."
Refinery Damage Status"The refinery damage status indicates the percentage of damage to a zone's fuel refineries, which then affects the resupply time of the field fuel structures."
Ammunition Factory Damage Status"The ammunition factory damage status indicates the percentage of damage to a zone's ammunition factories, which then affects the resupply time of the ordnance available at the fields."
Radar Factory Damage Status"The radar factory damage status indicates the percentage of damage to a zone's radar factories, which then affects the resupply time of radar at the fields."
Training Barracks Damage Status"The training barracks damage status indicates the percentage of damage to a zone's training barracks, which then affects the resupply time of bunkers and troops available at the fields."
Ack Factory Damage Status"The ack factory damage status indicates the percentage of damage to a zone's ack factories, which then affects the resupply time of field ack."
HQ Status"Enemy and Friendly Cnt refers to sector counters, or the red or green squares in the map sectors, for friendlies and enemies. If a country's HQ is destroyed, then all radar and sector counters for that country are disabled. As the HQ becomes damaged the radar components are destroyed in this order: friendly counters, enemy counter, friendly radar and enemy radar."
