TLDR: 6 checks with the system text size turned up: everything in the app gets bigger (up to 2× at the largest accessibility size); at the large sizes the tab bar drops its labels and grows its icons; hero cards drop their image so the words get the space; the menu drawer keeps its MY MEC card pinned to the bottom with the list scrolling above it; a change made while the app is open is picked up without a restart; and ALPA web pages opened inside the app scale too.
xcrun simctl ui <udid> content_size accessibility-extra-extra-extra-large;
… content_size large restores the default.Steps: Set the largest text size (see above), then open the app on Home.

Default size (1.0×)

Largest accessibility size (2.0×)
What you should see: Headings, card titles and category rows are roughly twice the size and wrap onto more lines. The tab bar shows its five icons only — larger than before, no text labels, evenly spaced, the active one still highlighted. The ALPA Magazine cards have no photo: just the title (and heart), in a card only as tall as its words.
Steps: With the app open at your normal text size, switch to Settings, set the largest size, and return to the app (do not force-quit). Then go back and restore your normal size, and return again.
What you should see: On each return the app is already at the new size — labels gone and icons bigger at the large size, labels and photos back at the normal size — with no relaunch and no flash of overlapping labels while it catches up. (On iOS the app reacts the moment the setting changes.)
Steps: At the largest size, open KCM → Airports, then Jumpseat → Alaska Airlines (any airline works).

KCM Airports — rows grow taller, NOTICE bar and chevrons stay aligned

A jumpseat policy — paragraphs wrap inside the blue panel
What you should see: Rows are taller; codes, titles and paragraphs wrap inside their panels; the NOTICE bar, back chevron and row chevrons stay in place; nothing is clipped; the icons-only bar is on every screen.
Steps: At the largest size, open Advocacy from Page Readiness.
What you should see: The PAC card heading wraps to two lines; DONATE & JOIN and SUBMIT MEETING REPORT are taller but whole; MEMBERSHIP INFORMATION wraps onto two lines and is still one tappable link. Every control still responds to a tap.
Steps: At the largest size, open the ☰ menu.
What you should see: The menu rows are bigger and the list scrolls (the last visible row fades out — drag up to reach FTDT, MEMBER CARD and the rest). The MY MEC card sits at the bottom of the screen, without its photo — just MY MEC, the MEC name and the description — and does not scroll with the list.
Steps: At the largest size, tap the PDR tab (or any Advocacy link). Then set your text size back to normal and return to the app.

PDR at the default size

PDR at the largest size — text doubled, page reflowed, nothing zoomed sideways
What you should see: The web page's text is about twice as big and wraps to the screen — you do not have to scroll sideways. Back at the normal size the page returns to its normal text without reloading.
That the app honours the phone's accessibility text size everywhere — the Blazor screens, the tab bar, the drawer and the web pages it opens — reacts to changes live, and at the large sizes trades decoration (labels under icons, photos on hero cards, the hero card's fixed height) for room for the words the member asked to have enlarged (AB#2530, AB#2545, AB#2546).