This site sells a toy plane pattern:

http://www.citiusa.com/misc.html

The only free pattern I found wasn't really a toy plane:

http://crochet.about.com/library/weekly/aa041903.htm

I have never tried it, but in theory there are ways to convert images to crochet patterns. So, if you had a picture of the plane you could try something like this:

http://www.maggiescrochet.com/pages/Leaflets/ASN_Annies/AA_874504_picture_afghans_main.htm

If you cross stitch, you could incorporate a fabric panel for the plane. You can download software to convert pictures to cross stitch patterns, like this:

http://www.gold-software.com/download2799.html

Sorry, I'm not more help. Good luck!

Here is a link that might be useful: craftfetish blog

I have used the graphs from this site before - I used the sports balls - and there are two planes. When I crocheted my blanket, I used single crochet but I guess you could test it in dc or hdc. Good luck. Post a picture when you finish.

Here is a link that might be useful: Shona's Place