 
Low Altitude Low Opening is a form of spawning the includes parachuting in from a transport plane, a few stories off the ground. This is only available to attackers in Sabotage, Acquisition or Domination.
Playes can be shot while in the process of reaching the ground, but allows some players to reach otherwise inaccessible rooftops. Also, all parachuters can only move, they cannot shoot.
All players start directly above the enemy AAA,(In sabotage, players are dropped above and between the relay towers) and fall inwards from there.