Invttation to Bid – Procurement of Services for the following: (1) Conveyance by Air for Domestic Inbound/Outbound Mail Dispatches from CMEC to VisMin Areas and vice-versa for Twenty Five (25) Destinations, and (2) Conveyance by Air for Domestic Direct Inter-Island Exchange of Mails from Visayas to Mindanao Areas and vice-versa for Twenty (20) Destinations