Airport transit visa (type A) – is issued for passing through the international transit areas of airports situated on the territory of the Member States.
Short-term visa (type C) – is issued for transit through or an intended stay in the territory of the Schengen States of a duration of no more than 90 days within the period of 180 days. Principles of calculating the period of stay on the Schengen territory.
If you wish to visit only Estonia, the Schengen visa has to be applied for at the Embassy of Estonia.
If the travel destination includes more than one Schengen member state, the application must be lodged at the representation of the main destination. The main destination is understood to be the destination where you intend to spend the longest time or where the main purpose of the intended journey is carried out.
If you wish to visit several Schengen member states and you are not sure of the state of main destination or plan to spend the equal number of days in each state, the visa must be applied for at the representation of the state through which the visa applicant intends to enter the Schengen area.