Based on the iPad Apple Store App, this is the device availability as of 4:52am EST:
iPhone 6
• Silver, 16GB, AT&T - Currently Unavailable
• Silver, 64GB, AT&T - Delivers 9/19
• Silver, 128GB, AT&T - Delivers 9/19
• Gold, 16GB, AT&T - Currently Unavailable
• Gold, 64GB, AT&T - Currently Unavailable
• Gold, 128GB, AT&T - Delivers 9/19
• Space Gray, 16GB, AT&T - Currently Unavailable
• Space Gray, 64GB, AT&T - Currently Unavailable
• Space Gray, 128GB, AT&T - Currently Unavailable
• Silver, 16GB, Sprint - Currently Unavailable
• Silver, 64GB, Sprint - Currently Unavailable
• Silver, 128GB, Sprint - Currently Unavailable
• Gold, 16GB, Sprint - Delivers 9/19
• Gold, 64GB, Sprint - Delivers 9/19
• Gold, 128GB, Sprint - Delivers 9/19
• Space Gray, 16GB, Sprint - Delivers 9/19
• Space Gray, 64GB, Sprint - Currently Unavailable
• Space Gray, 128GB, Sprint - Currently Unavailable
• Silver, 16GB, Verizon - Delivers 9/19
• Silver, 64GB, Verizon - Delivers 9/19
• Silver, 128GB, Verizon - Delivers 9/19
• Gold, 16GB, Verizon - Delivers 9/19
• Gold, 64GB, Verizon - Delivers 9/19
• Gold, 128GB, Verizon - Delivers 9/19
• Space Gray, 16GB, Verizon - Delivers 9/19
• Space Gray, 64GB, Verizon - Currently Unavailable
• Space Gray, 128GB, Verizon - Delivers 9/19
iPhone 6 Plus
• Silver, 16GB, AT&T - Delivers 9/19
• Silver, 64GB, AT&T - 7-10 Business Days
• Silver, 128GB, AT&T - Currently Unavailable
• Gold, 16GB, AT&T - Currently Unavailable
• Gold, 64GB, AT&T - Currently Unavailable
• Gold, 128GB, AT&T - Currently Unavailable
• Space Gray, 16GB, AT&T - Delivers 9/19
• Space Gray, 64GB, AT&T - 7-10 Business Days
• Space Gray, 128GB, AT&T - Currently Unavailable
• Silver, 16GB, Sprint - 7-10 Business Days
• Silver, 64GB, Sprint - 7-10 Business Days
• Silver, 128GB, Sprint - 7-10 Business Days
• Gold, 16GB, Sprint - 7-10 Business Days
• Gold, 64GB, Sprint - 7-10 Business Days
• Gold, 128GB, Sprint - 7-10 Business Days
• Space Gray, 16GB, Sprint - 7-10 Business Days
• Space Gray, 64GB, Sprint - 7-10 Business Days
• Space Gray, 128GB, Sprint - Delivers 9/19
• Silver, 16GB, Verizon - 7-10 Business Days
• Silver, 64GB, Verizon - 7-10 Business Days
• Silver, 128GB, Verizon - Currently Unavailable
• Gold, 16GB, Verizon - 7-10 Business Days
• Gold, 64GB, Verizon - Currently Unavailable
• Gold, 128GB, Verizon - 7-10 Business Days
• Space Gray, 16GB, Verizon - 7-10 Business Days
• Space Gray, 64GB, Verizon - Delivers 9/19
• Space Gray, 128GB, Verizon - Currently Unavailable
Looks like Verizon customers have it best. We of the AT&T clan must settle for the scraps . . .