Are these noise-canceling enough to wear on a plane and not hear the plane noise?

They do NOT have electronic noise canceling. They are over the ear. The cups absorb outside sound but not enough that would be considered "noise cancelling". They're mainly for DJ's, home, and professional studio producers who use them because electronic "Noise Cancelling" tech interferes with recordings.

are these good for big heads? i have trouble finding headphones that fit comfortably over my big head. also i wear glasses if that helps

They grip my average size head fairly firmly. Not enough to hurt but a big head may have problems. I was able to bend mine a bit to lighten the grip

How does this compare to the ATH-M30? And how comfortable is it for extended hours of use?

I can only respond to the 2nd part of your question as I have not tried the ATH-M30, but the ATH M20X was (for me) extremely uncomfortable even after using for only a short period of time. This was due to the, IMO, excessive heat build-up which literally caused pools of sweat to collect inside the earpieces. I returned the headset after a few days.

Do these headphones come with a carrying case?

No, they don't come, but I suggest to buy a case just in case. If you don't want to, buy it without a case, those are durable headphones, but you never know if you'll need the case to carry them in a bag, back pack, carry on.

ASIN	B00HVLUR18
Age Range Description	Adult
Antenna Location	Entertainment, Outdoor, Calling, Music, Gaming, Travel
Best Sellers Rank	#75 in Musical Instruments ( See Top 100 in Musical Instruments ) #1 in DJ Headphones
Box Contents	Headphone
Brand	Audio-Technica
Brand Name	Audio-Technica
Cable Features	Detachable
Colour	Black(Wired)
Compatible Devices	Laptops, Mobile Phones, Tablets, PC, All Wired Jack Devices, iOS, Andriod
Control Method	Touch
Control Type	Voice Control
Country of Origin	China
Customer Reviews	4.4 out of 5 stars 27,475 Reviews
Ear Placement	Over Ear
Enclosure Material	Neodymium, Copper-Clad Aluminium, Plastic, Faux Leather
External Testing Certification	Não aplicavel
Form Factor	Over Ear
Frequency Response	20000 Hz
Global Trade Identification Number	00042005183517
Headphone Form Factor	Over Ear
Headphone Jack	3.5mm and 6.3mm (With included adapter)
Headphones Ear Placement	Over Ear
Impedance	47 Ohms
Impedance Unit of Measure	47 Ohms
Importer Contact Information	Alphatec Audio Video Pvt Ltd, Alphatec Audio Video Pvt. Ltd.
Is Autographed	No
Is Electric	No
Item Type Name	Headphones
Item Weight Unit of Measure	210 Grams
Manufacturer	Audio Technica, Audio-Technica
Manufacturer Contact Information	Audio Technica
Model Name	ATH-M20x
Model Number	094375870
Network Connectivity Technology	Wired
Noise Control	Sound Isolation
Number of Items	1
Packer Contact Information	Alphatec Audio Video Pvt Ltd
Product Features	Designed for studio tracking and mixing
Sensitivity	96.0
Specific Uses For Product	Professional
Style Name	Headphones
UPC	042005183517
Unit Count	1 Count
Warranty Description	1 Year
Wireless Technology Type	True Wireless

ATH-M20x Over-Ear Professional Studio Monitor Headphones

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