“Will & Grace” star Eric McCormack pitched al hissy fit aboard a plane bound for Vancouver when the crew told him that a booster seat he brought for his 4-year-old son, Finnigan, was too large and had to be stowed in the luggage hold. “Eric screeched like a banshee when he didn’t get his way,” said the insider. “He yelled at crew members - telling them his family had used the seat on many flights in the past,” said the insider. “But the price tag was still on it…”

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