Our company uses OBCs sometimes, usually when we have to move AOG aircraft parts faster than a commercial courier can handle (weekends for example).

The notice period is usually a few hours at most and the courier tends to fly right back after arriving at destination (a few hours layover maximum). We use ACS (www.acs.ae/cargo-charter/on-board-courier) to set up our OBC requirements and we are very pleased with them both on pricing and service standards.