I guess Americans don't pronounce the T as strongly as the Brits. Maybe a stop T is in there.

Ireland

I’m an American English speaker and I’ve heard it pronounced two ways. #1 Americans usually pronounce it like Der-rect-ly. You want to use the “Er” sound after the D. As in the word Flower. The letters “ly” at the end of the word sound like “lee”. #2 British speakers pronounce it like D-eye-rect-ly. The The letter “I” is pronounced with the long “I” sound or like the sound in the word “eye”. The “ly” at the end also sound like “lee” Either way of pronunciation is fine, but I’m an American and most of us would tell you to say it like option 1.

From Australia :)

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