Here, for the sake of posterity, is the bird list for 9/19, as reported to NYC Bird Report. The (D) marks birds unusual for the date, either early or late for their expected appearances, or ones that are somewhat rare on any date. An (H) indicates the first sighting of the half year, i. e. the Fall migration period. There’s one (Y) bird, the Connecticut Warbler, making its first appearance of the year. Its migration route is west of the Appalachians in the Spring, east in the Fall, so we virtually never see it except in the Fall.
More information on the birds can be found at the actual NYC Bird Report site, by viewing the expectation lists, and clicking on particular species to view dates and sightings.

Central Park
9/19/04

Double-crested Cormorant
Green Heron
Black-crowned Night-Heron
Turkey Vulture (D)
Canada Goose
Mute Swan (D)
Wood Duck (D)
Gadwall
American Black Duck
Mallard
Northern Shoveler (D)
Osprey
Northern Harrier (D)
Sharp-shinned Hawk
Cooper's Hawk
Broad-winged Hawk (D)
Red-tailed Hawk
American Kestrel
Peregrine Falcon
Spotted Sandpiper
Laughing Gull (D)
Ring-billed Gull
Herring Gull
Great Black-backed Gull
Rock Pigeon
Mourning Dove
Chimney Swift
Ruby-throated Hummingbird
Belted Kingfisher
Red-bellied Woodpecker
Yellow-bellied Sapsucker (D)
Downy Woodpecker
Hairy Woodpecker (D)
Northern Flicker
Eastern Wood-Pewee
Yellow-bellied Flycatcher
Least Flycatcher
Eastern Phoebe
Great Crested Flycatcher
Eastern Kingbird (D)
White-eyed Vireo (D)
Blue-headed Vireo (D)
Yellow-throated Vireo (D)
Warbling Vireo
Philadelphia Vireo (D)
Red-eyed Vireo
Blue Jay
American Crow
Barn Swallow (D)
Tufted Titmouse
Red-breasted Nuthatch (D)
White-breasted Nuthatch
Carolina Wren
House Wren
Winter Wren (D)
Marsh Wren (HD)
Golden-crowned Kinglet (HD)
Ruby-crowned Kinglet
Blue-gray Gnatcatcher
Veery
Gray-cheeked Thrush
Swainson's Thrush
Wood Thrush
American Robin
Gray Catbird
Northern Mockingbird
Brown Thrasher
European Starling
Cedar Waxwing
Blue-winged Warbler (D)
Tennessee Warbler (D)
Nashville Warbler
Northern Parula
Yellow Warbler (D)
Chestnut-sided Warbler
Magnolia Warbler
Cape May Warbler (D)
Black-throated Blue Warbler
Yellow-rumped Warbler (D)
Black-throated Green Warbler
Blackburnian Warbler
Pine Warbler
Prairie Warbler
Palm Warbler
Bay-breasted Warbler (D)
Blackpoll Warbler
Cerulean Warbler (D)
Black-and-white Warbler
American Redstart
Ovenbird
Northern Waterthrush
Kentucky Warbler (HD)
Connecticut Warbler (YD)
Common Yellowthroat
Wilson's Warbler
Canada Warbler
Yellow-breasted Chat (D)
Scarlet Tanager
Eastern Towhee (D)
Chipping Sparrow (D)
Field Sparrow (HD)
Savannah Sparrow (D)
Song Sparrow
Lincoln's Sparrow
Swamp Sparrow (D)
White-throated Sparrow (D)
Dark-eyed Junco (D)
Northern Cardinal
Rose-breasted Grosbeak
Indigo Bunting (D)
Red-winged Blackbird
Common Grackle
Brown-headed Cowbird (D)
Baltimore Oriole
House Finch
American Goldfinch
House Sparrow

117 species (excluding hybrids and reported with full confidence)

And we probably missed a few. But I think the average New Yorker would be surprised to know that all these birds are passing them by, and are there to be seen, right in (or over) the middle of Manhattan.