plan

/plan/

Cases

SingularPluralWhen to use it
nominativeplanthe planplanlathe plansthe plain dictionary form — the doer of the sentence
genitiveplannıthe plan'splanlanıthe plans'the owner — whose it is
accusativeplannıthe plan (as the object)planlanıthe plans (as the object)a specific, known object — whom or what
dativeplangato the planplanlağato the plansdirection or recipient — to where, to whom
locativeplandaat / in the planplanladaat / in the planswhere it is; also having — mende bar, "I have it"
ablativeplandanfrom the planplanladanfrom the planswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myplanımmy planplanlarımmy plans
yourplanıngyour planplanlarıngyour plans
his / herplanıhis / her planplanlarıhis / her plans
ourplanıbızour planplanlarıbızour plans
you all'splanığızyou all's planplanlarığızyou all's plans
theirplanlarıtheir planplanlarıtheir plans

The overlap in the last rows is real, not a mistake: planları can mean "his / her plans", "their plan", or "their plans" — context decides.