QUOTE(NickD @ Jul 1 2008, 03:31 PM)

QUOTE(fwaguy @ Jul 1 2008, 03:24 PM)

No you need your extention letter
And your expired green card, that extension form extends, extension form is worthless without your green card.
I would just say though, that if it's easy for you to get the stamp, and you have any kind of worry or uncertainty... there's no harm in getting the stamp anyway.... as a backup so-to-speak.
Some countries / airlines of late have taken it upon themselves to "check" your immigration papers/visas etc before allowing you to board the aircraft... these people are not immigration officers and are not aware of all of the options... so if you get one that really doesnt know what they're doing, you can end up getting denied boarding onto your flight to come back, even though you would not get denied at the actual POE in the US.
The most recent case where I saw this happen in person was at Paris CDG airport, where a very anal airline employee who thought he knew what he was doing stopped several people from boarding for various stupid reasons... i.e. In one case he was actually stopping a US Army Officer, who was a US Citizen showing a US Passport, from boarding, because he refused to show the guy (a french citizen) a copy of his orders! It was only when several of us ganged up on him (the line was being held up) and pointed out that a US Citizen has the right to enter the US no matter what his orders, and that it wasn't up to him to determine if this guy was obeying orders - that he finally let him through...
Of course, you are legally OK entering the US on just your passport, greencard and Extension letter... but, as I say, if it's no trouble for you to make an infopass appointment and get a passport stamp too... it won't hurt, and might help you if you run into a similar idiot.