Delta Air Lines passengers flying through notoriously congested Los Angeles International Airport will soon enjoy about double the amount of terminal space and nine additional passenger gates under a $1.9-billion terminal renovation project that is more than a year ahead of schedule. Delta executives and LAX representatives offered a sneak peek at the expanded and renovated terminal project Tuesday which will be open to the public next month. It will feature 27 gates — compared with the 16 passenger gates offered before the overhaul — and 1.2-million square feet for passengers, compared with 6…