Solution to Flat Containers

This puzzle consists of 3 NPL-style flats (all of the "word deletion" type), plus a final couplet telling you how to put them all together.

 

WORD DELETION (9)
My love for my pets runs incredibly deep;
My dogs always have somewhere comfy to sleep.
My pugs each have twin beds, and just down the hall
I've got poodles on cots and WITHOUT WITHIN ALL!

WITHOUT WITHIN ALL -> BASSETS IN BASSINETS

 

WORD DELETION (9)
On the deck of my sailboat I look up and sigh
And jealously watch as an INNER soars by.
I wish I were OUTER—then I could fly free
And finally get a FULL view of the sea!

INNER OUTER FULL -> TERN ALATE ALTERNATE

 

WORD DELETION (6)
Humanity's vices have caused global warming,
And that's why we've had such unusual storming.
Our rules for pollution have been far too lenient.
(It's true, even though it might not be convenient!)
And if you still doubt that the earth will get fried,
There is data COMPLETE—just ask CENTER OUTSIDE!

COMPLETE CENTER OUTSIDE -> GALORE AL GORE

 

The answer you seek is WITHIN INNER CENTER
Just string them together and you can press Enter!

As instructed by the final couplet, put together the internal words from the flats to get, well, INTERNAL.