Been a while since I wrote. Too busy with travel and work etc but hope you enjoy this cover. Picked it up today in the Mong Kok stamp arcade here in Hong Kong.  —   Wonderful place and so much to enjoy, so many stamp shops.–  issued in July 1998 to commemorate the opening of Chek Lap kok ( lovely airport I might add)   I am offering this as a prize to the first correct email to me at  and you must include your mailing address of course…..    if you get the correct answer to this question………  how many aircraft are there depicted on this cover  will publish  answer in a  few days..