the most ive ever taken was eight, i flew every one of them.
usually its 3-5, took the back seat out of the minivan and i can fit 4 models easily 6 if i organize and 8 if i set a few on top, thats not counting the 3 i can put between the middle seats, could put 2 more in the front seat and a 1 in the isle....
minivans arnt half bad if you like to fly planes.
granted im flying 40 sized planes for the most part, a few .60's but also a few .32's