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.

Noise Control	Sound Isolation
Frequency Response	20000 Hz
Sensitivity	96.0
Headphones Jack	3.5mm and 6.3mm (With included adapter)
Model Name	ATH-M20x
Connectivity Technology	Wired
Wireless Communication Technology	True Wireless
Included Components	Headphone
Age Range (Description)	Adult
Material	Neodymium, Copper-Clad Aluminium, Plastic, Faux Leather
Specific Uses For Product	Professional
Recommended Uses For Product	Entertainment, Outdoor, Calling, Music, Gaming, Travel
Compatible Devices	Laptops, Mobile Phones, Tablets, PC, All Wired Jack Devices, iOS, Andriod
Control Type	Voice Control
Cable Feature	Detachable
Item Weight	210 Grams
Net Quantity	1.00 Count
Style	Headphones
Control Method	Touch
Number of Items	1
Hardware Interface	3.5mm Audio
UPC	042005183517
Supports Bluetooth Technology	No
Special Feature	Designed for studio tracking and mixing
Global Trade Identification Number	00042005183517
Manufacturer	Audio Technica, Audio-Technica
Model	094375870
Model Year	2014
Product Dimensions	28.96 x 25.4 x 10.41 cm; 210 g
Item model number	094375870
Computer Memory Type	DIMM
Hardware Platform	Laptop, Smartphone
Special Features	Designed for studio tracking and mixing
Microphone format	without microphone
Voltage	12 Volts
Batteries Included	No
Batteries Required	No
Cable feature	Detachable
GSM frequencies	20000 Hz
Speaker Output Channel Quantity	2
Form Factor	Over ear
Does it contain liquid?	No
Includes Rechargeable Battery	No
Is there a timer?	No
Includes AC Adapter	No
Manufacturer	Audio-Technica
Country of Origin	Taiwan
Imported By	Alphatec Audio Video Pvt Ltd
Item Weight	210 g

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