My 2 year old loves airplanes and my husband works for an airline so this was a family effort! For invitations, I used the idea of a boarding pass and went to the scrapbooking place to get paper the right texture and color. Each person (not just family) received a boarding pass in their ticket jacket from Nick's Travel Company". The boarding pass had "boarding time"  (start of party) "Terminal and Gate"  (Street address) and number in party. I was able to download the bar code font and the numbers used to make the barcode were my son's birthdate.  We created a fantasy airline name "Nicholscott Airlines" and had it on the return address.  This took a long time to create but I had an airline friend do the double-take to see if they were real!  For decorations we put a sign in the driveway stating "Loading Zone Only".  The walkway to the house was lined with balloon stanchons.  By the door I had a box labeled "Baggage Check-in" where people could leave the gifts. Inside the house we clustered white and light blue balloons together and floated them on the ceiling to look like clouds and had large styrofoam airplanes hanging from the ceiling as well.  In the backyard we labeled the trampoline a "flight simulator" but you could do the same for a rented jumper. I waited for material to go on sale and bought cloud material to use as table cloths and ironed on airplanes. Kids food was served on those sectioned plates to resemble airplane food and contained sandwiches chips and fruit.  We made all of the family members "uniforms" i.e. t-shirts with our "Nicholscott" Airline logo that resembled flight wings using iron-on computer paper. The birthday boy was the pilot brother co-pilot Dad crew chief and Mom flight attendant.  All guests received stick-on pilot wings.  Since my 2 year old and friends really would not play games my husband made a small play table and painted it like a runway and we took our son's collection of "Jay-Jay the Jet Plane" airplanes and some other small airplanes for the kids to play with in the back yard. I bought a plain white sheetcake and then bought a can of blue edible spray (made by Wilton at Michaels) to make airbrushed like clouds on the cake and put small airplanes on it.  As a favor I took white lunch bags and folded them to look like the "barf" bags from an airline. The kids had no idea but the adults got a kick out of it!  I created a nametag that looked like the electronic bag tag that goes on your luggage.  Instead of the 3 letter city code it said THX for "thanks"  and said thanks for flying with us and each bag had die-cast airplanes and airplane stickers in it. We had a total blast throwing the party and the kids as well as adults enjoyed the theme."