Yahoo used to delete the expiring option chains about 2 hours after market close on Friday. During the last two weeks they appear to be deleting them two days BEFORE they expire. The September 25 weekly option chains have now been deleted. I hope this is a glitch and they fix it soon.
Looking on Thinkorswim, I am seeing the Yahoo SEP4-15 weekly option calls and put chain. I am not sure an underlying can remove a weekly chain after its already been published, as there are holders and writers of those options once they are published.
If I understand correctly OTM-Options is saying Yahoo is no longer a good site to retrieve options data from. Normally this wouldn't interest me but I had an issue checking email at Yahoo today. Maybe someone from Yahoo will notice.
Yes that is correct. Yahoo Finance is the first place I go to for option chains, their layout is very good.
With Yahoo Finance you can click on a strike and get more info: You can't with Google Finance and the Nasdaq site is painfully slow.