For our “3 weeks + 3 excursions” flagship program, you must book a plane ticket to LAX, with the arrival date corresponding to the first day of the program. You are free to choose the flight you prefer, if the date of arrival at LAX is respected. This is for logistical transportation and organizational reasons.
For the “À la carte” program, you have the most flexibility with your flight options: you choose the dates of your program.