Don't worry about getting the pet formula. The human formula is just fine. I use the pet formula because I give it to them regularly, and I don't want to turn them into furry little alcoholics!
For flying the regular formula shouldn't cause any problems.
To give a dosage idea, I give 2-3 drops for my 2.7 lb dog every 3-4 hours on a flight and for my 9 pounder I give 4-5 drops every 3-4 hours. It takes 45 minutes to kick in and please test it on your pup before Sunday, so if he has an adverse reaction, its not on travel day!
Also, try it yourself, 10 drops dissolved in a cup of chamomile tea or 7-9 drops directly under the tongue. It will make you more relaxed as well!