IMPORTANT NOTE: It is much more beneficial to fully upgrade a plane than to fly a "better" plane that is not upgraded.
For this reason, I recommend that a beginner stick with one or two planes and focus on upgrading them. This will cost you credits and will also cost you
One thing that many players are not aware of is that once you buy a plane, all upgrades for that class of plane are the same from there forward (although you do have to upgrade each plane separately unfortunately). There are 3 upgrade trees, one for each class of plane. Also, all upgrades cost the same, no matter what class of plane you have. The map of upgrade costs are as follows (UPDATED FOR version 5.0 now showing the medals required instead of coins):
|Upgrade Tree as of 3/16/13|
As you can see in the cumulative totals on the right, if you want to get ALL of the upgrades it will cost you 13,900 credits and
As for upgrade percentage boosts, they are identical for each class of plane. The only difference in fully upgraded planes of the same class are the initial increases that are advertised when you buy the plane. For example the only difference between a fully upgraded Thresher and a fully upgraded Annihilator is the advertised numbers as seen below:
Here is the table of upgrades for each class of plane that you can expect if you receive for a full upgrade of your plane:
|Upgrade Table per Plane Class|
You can see how the weapons class planes focuses on weapons related upgrades, agility class planes on speed, acceleration upgrades... and defense class on armor. It took me awhile to learn how this works but.thanks goes out to WarWolf[Beta and Floris for some of the postings that I've found that help explain this!