Are we at the stage yet where we can list all the birds he hasn't yet seen? (Code 1 and 2, in addition to probable code 3s?). Having done so well early on surely there are now going to be periods of inactivity whilst he waits for birds to turn up and be available to chase, along with a few more specific trips for summer migrants.
You asked.........
Code 1 birds - 103 species:-
Willow Ptarmigan
Rock Ptarmigan
Black-footed Albatross
Cory's Shearwater
Great Shearwater
Audubon's Shearwater
Wilson's Storm-Petrel
Leach's Storm-Petrel
Wood Stork
Mississippi Kite
Virginia Rail
American Golden-Plover
Solitary Sandpiper
Wandering Tattler
Upland Sandpiper
Hudsonian Godwit
White-rumped Sandpiper
Buff-breasted Sandpiper
Semipalmated Sandpiper
Wilson's Phalarope
Red-necked Phalarope
Parasitic Jaeger
Long-tailed Jaeger
Thick-billed Murre
Atlantic Puffin
Horned Puffin
Tufted Puffin
Sabine's Gull
Franklin's Gull
Least Tern
Black Tern
Common Tern
Arctic Tern
Elegant Tern
Yellow-billed Cuckoo
Black-billed Cuckoo
Short-eared Owl
Lesser Nighthawk
Common Nighthawk
Mexican Whip-poor-will
Chimney Swift
Vaux's Swift
Rufous Hummingbird
Calliope Hummingbird
Red-headed Woodpecker
Red-naped Sapsucker
Olive-sided Flycatcher
Western Wood-Pewee
Eastern Wood-Pewee
Yellow-bellied Flycatcher
Acadian Flycatcher
Alder Flycatcher
Willow Flycatcher
Least Flycatcher
Cordilleran Flycatcher
Brown-crested Flycatcher
Western Kingbird
Eastern Kingbird
Warbling Vireo
Philadelphia Vireo
Red-eyed Vireo
Bank Swallow
Sedge Wren
Veery
Gray-cheeked Thrush
Swainson's Thrush
Wood Thrush
Chestnut-collared Longspur
Worm-eating Warbler
Northern Waterthrush
Blue-winged Warbler
Prothonotary Warbler
Tennessee Warbler
Colima Warbler
Virginia's Warbler
MacGillivray's Warbler
Mourning Warbler
Cape May Warbler
Magnolia Warbler
Bay-breasted Warbler
Blackburnian Warbler
Chestnut-sided Warbler
Blackpoll Warbler
Canada Warbler
Yellow-breasted Chat
Grasshopper Sparrow
Le Conte's Sparrow
Nelson's Sparrow
Saltmarsh Sparrow
Seaside Sparrow
Harris's Sparrow
Scarlet Tanager
Western Tanager
Rose-breasted Grosbeak
Blue Grosbeak
Lazuli Bunting
Indigo Bunting
Dickcissel
Bobolink
Yellow-headed Blackbird
Orchard Oriole
Bullock's Oriole
Baltimore Oriole
Code 2 birds - 63 species:-
King Eider
Himalayan Snowcock
Dusky Grouse
Arctic Loon
Laysan Albatross
Mottled Petrel
Black-capped Petrel
Buller's Shearwater
Short-tailed Shearwater
Manx Shearwater
Fork-tailed Storm-Petrel
Ashy Storm-Petrel
Band-rumped Storm-Petrel
Black Storm-Petrel
Red-faced Cormorant
Yellow Rail
Pacific Golden-Plover
Common Ringed Plover
Bristle-thighed Curlew
Bar-tailed Godwit
South Polar Skua
Kittlitz's Murrelet
Parakeet Auklet
Least Auklet
Whiskered Auklet
Crested Auklet
Red-legged Kittiwake
Brown Noddy
Sooty Tern
Bridled Tern
Aleutian Tern
Roseate Tern
Groove-billed Ani
Flammulated Owl
Whiskered Screech-Owl
Elf Owl
Antillean Nighthawk
Black Swift
Blue-throated Hummingbird
Northern Beardless-Tyrannulet
Sulphur-bellied Flycatcher
Thick-billed Kingbird
Gray Kingbird
Black-capped Vireo
Gray Vireo
Black-whiskered Vireo
Arctic Warbler
Bluethroat
Northern Wheatear
Bicknell's Thrush
Eastern Yellow Wagtail
Sprague's Pipit
Golden-winged Warbler
Connecticut Warbler
Kirtland's Warbler
Cerulean Warbler
Golden-cheeked Warbler
Red-faced Warbler
Botteri's Sparrow
Bachman's Sparrow
Baird's Sparrow
Henslow's Sparrow
Varied Bunting
Code 3 birds - 61 species not seen so far by Olaf of which Neil Hayward saw 36 species:-
Tundra Bean-Goose
Whooper Swan
Spectacled Eider
Trindade Petrel
Flesh-footed Shearwater
Least Storm-Petrel
Red-billed Tropicbird
Masked Booby
Lesser Sand-Plover
Gray-tailed Tattler
Black-tailed Godwit
Sharp-tailed Sandpiper
Curlew Sandpiper
Red-necked Stint
Common Snipe
Craveri's Murrelet
Ross's Gull
Slaty-backed Gull
Black Noddy
Ruddy Ground-Dove
Ferruginous Pygmy-Owl
Buff-collared Nightjar
Berylline Hummingbird
White-eared Hummingbird
Budgerigar
La Sagra's Flycatcher
Fork-tailed Flycatcher
Yellow-green Vireo
Eyebrowed Thrush
White Wagtail
Olive-backed Pipit
Red-throated Pipit
Tropical Parula
Five-striped Sparrow
Rustic Bunting
Brambling
All the best